The toughest bits available, these withstand the shock and twisting force of impact drivers.

A retaining ring at the tip grips inside the recess to ensure screws won't slip off the bit.

Protect your stainless steel screws by using a stainless steel bit. If steel flakes off a standard bit and into the recess, it can lead to rust and contamination. These bits eliminate that risk.

Less likely to crack or shatter under high torque than standard bits, these are often used with power tools to install machine screws.

Ribs forged into the wings of these bits grip the screw recess to reduce stripping. They're also known as ACR® bits.

The small-diameter shaft can access screws in narrow recessed holes.

Remove screws in hard-to-reach places. A spring-loaded sleeve guides bits onto the screw head and keeps them from slipping out.

Protect your stainless steel screws by using a stainless steel bit. If steel flakes off a standard bit and into the recess, it can lead to rust and contamination. These bits eliminate that risk.

Strong and durable, these multipurpose bits are for use with bit screwdrivers. They are often used with power tools to install sheet metal screws.

Bits have a different size at each end.

Remove screws in hard-to-reach places. A spring-loaded sleeve guides bits onto the screw head and keeps them from slipping out.

Strong and durable, these multipurpose bits are often used with power tools to install sheet metal screws.

Less likely to crack or shatter under high torque than standard bits, these are often used with power tools to install machine screws.

The slightly tapered tip wedges into the screw recess for a secure hold. Also known as Torx-Align bits.

Protect your stainless steel screws by using a stainless steel bit. If steel flakes off a standard bit and into the recess, it can lead to rust and contamination. These bits eliminate that risk.

The toughest bits available, these withstand the shock and twisting force of impact drivers. Designed for screws with a square recess in the head, they are also known as Robertson bits.

An exterior stop collar prevents fasteners from being driven too deep. Use with soft materials such as drywall, wood, and fiberboard.

An opening at the tip accommodates the pin in the recess of tamper-resistant Torx screws. These are also known as pin-in-Torx bits.

The six rounded points fit the star-shaped recess of Torx-Plus screws. These bits have a similar profile to Torx but are not recommended for use with standard Torx screws.

Ribs forged into the wings of these offset-cross-shaped bits grip the screw recess to reduce stripping. They are also known as ACR® bits.

An opening at the tip accommodates the pin in the recess of tamper-resistant square screws.

Also known as Polydrive bits.

While screws with a Square/Phillips combination drive can be turned with either a Square or Phillips bit, these make the best contact so you can apply high torque without slipping and stripping the recess. They are also known as Quadrex bits.

Turn two drive styles with one reversible bit. Remove and replace to change the tip.

An opening at the tip accommodates the pin in the recess of tamper-resistant Phillips screws. These are also known as pin-in-head Phillips bits.

These are also known as known as butterfly and Type G bits.

The tip is shaped like an eight-pointed star.

An opening at the tip accommodates the pin in the recess of tamper-resistant hex screws. These are also known as pin-in-hex or pin-in-socket bits.

Turn the screws found in Apple devices.

These bits have a 4 mm HIOS shank. To fit in a 1/4" hex shank driver, use an adapter.

Turn screws that have the tamper-resistant asymmetrical drive exclusive to McMaster-Carr.

Because they make contact on the flat sides of fasteners rather than only on the corners, these magnetic bits significantly reduce slipping and stripping. They’re also known as lobular bits.

The toughest bits available, these withstand the shock and twisting force of impact drivers. A magnet holds the nut in place.

The toughest bits available, these withstand the shock and twisting force of impact drivers.

The knurled shank on these bits allows finger tightening. They can also be used with the included screwdriver.

A retaining ring grips inside the recess to hold screws in place. These bits have a ball end that allows angled entry to drive screws in hard-to-reach areas.

Ribs forged into the wings of these bits grip the screw recess to reduce stripping. They're also known as ACR® bits.

A magnet holds the nut in place.

The slightly tapered tip wedges into the screw recess for a secure hold. These are also known as Torx-Align bits.

These bits have an offset cross shape.

Use with screws that have two drilled holes.

A three-winged tip fits triangular slotted screw recesses.

Grip the indentations on the head of tri-groove fasteners.

Lock your bit into the adapter to prevent accidental disengagement. These adapters hold hex-shank bits (also known as insert bits) in powered tools.

Bend these adapters up to 90° to access hard-to-reach fasteners. Use them to hold hex-shank bits (also known as insert bits) in powered tools.

Keep bits from slipping. Insert a bit into the adapter, place a screw on the end of the bit, and slide the adapter sleeve over the screw. The sleeve retracts as the screw is driven. These adapters hold hex-shank bits (also known as insert bits) in powered tools.

Attach these adapters to square-drive tools.

These adapters are designed to withstand the high torque of impact drivers. They hold hex-shank bits (also known as insert bits).

Eliminate the need for multiple bulky tools with these bit adapters. At less than 3 inches long, these compact adapters convert ¼” bit screwdriver handles and ¼” bits into torque screwdrivers so you can fasten to a specific torque.

Keep these caddies in your tool drawer or take them with you.

Mount the magnetic base to walls, cabinets, and other steel surfaces.

A ratchet mechanism turns fasteners more quickly than a standard bit driver. Insert a bit into the shaft and a magnet holds it in place.

LEDs light the tip so you can use these tools in dark areas.

Bits are held in place with a retaining ring or set screw rather than a magnet, so the tool won't attract loose metal parts and shavings.

Insert a bit into the shaft and a magnet holds it in place.

Also known as ESD-safe bit screwdrivers, the handle drains static away from your application, preventing buildup from electrostatic discharge (ESD) that can damage sensitive equipment.

When working in tight spaces, these short drivers fit where others can't. Bits have a different tip at each end and snap into the shaft, which is also a nutdriver.

Create your own tool by attaching these shafts to a handle, or use with socket wrenches and power tools. They have a ball end that allows angled entry to make good contact with the recess when a standard-tip shaft can’t.

Optimized for use on steel, these inserts can run at higher cutting speeds and will last longer than inserts for multiple materials.

Made of an abrasion-resistant carbide designed for turning cast iron, these inserts will last longer than inserts for multiple materials.

Use these carbide inserts for general purpose turning.

Heat resistant and wear resistant, these inserts cut super alloys—such as Inconel and Waspaloy—and titanium better than general use inserts.

Replace clamps, screws, seats, and slotted pins in carbide insert holders.

Resisting wear and fractures when cutting hardened steel, these cubic boron nitride inserts last longer than carbide inserts.

Deliver coolant through the holder to keep workpieces cool while boring tough materials, such as steel, stainless steel, and nickel-based alloys.

These sets have a variety of indexable boring insert holders with carbide inserts and a wood storage stand. When one edge of a tool's insert dulls, rotate it to use a sharp edge to enlarge existing holes to precise diameters.

Pair these holders with a tool block for right- and left-hand mounting in a lathe.

Mount blade-style holders to a lathe tool post or turret.

Pair these holders with a tool block for right- and left-hand mounting in a lathe.

Cut square corner grooves in a workpiece or cut completely through a part.

Pair these holders with a threading insert or a grooving insert to make cuts on the outside of a workpiece.

Pair these holders with a threading insert or a grooving insert to make cuts on the inside of a hollow workpiece.

Contour the interior wall of a hollow workpiece when you pair a holder with a compatible insert.

The long steel shank on these tools can reach farther inside the workpiece than standard boring tools.

These sets contain some of the smallest boring tools we offer.

Create a knurled pattern on the end of a workpiece.

Attach these tools to a manual lathe.

Cut threads in plastic and most metal with these high-speed steel tools.

A carbide tip brazed onto a ground steel shank makes these tools more wear resistant than high-speed steel tools.

The diamond tip on these tools offers superior cutting performance on nonferrous and nonmetallic materials, such as aluminum, copper, fiberglass, and plastic.

Use these tools to enlarge existing holes to precise diameters.

Solid carbide provides more rigidity than carbide-tipped tools.

The long steel shank on these tools can reach farther inside the workpiece than standard boring tools.

The carbide tip brazed onto the ground steel shanks of these tools is more wear resistant than high-speed steel.

Machine grooves in plastic and most metal with these high-speed steel tools.

Insert the square shank of these tools into the slot of a boring tool holder and use them to enlarge existing holes to precise diameters.

An extra-long shank provides additional reach.