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

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.

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

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

Drive screws with both ends of these bits. Use with hand drivers.

Strong and durable, these multipurpose bits are for use with bit screwdrivers.

When you don't have exact alignment between the fastener and the tool, the ball end allows angled entry to turn screws in hard-to-reach areas.

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

Strong and durable, these multipurpose bits are for use with bit screwdrivers. They're designed for screws with a square recess in the head and are also known as Robertson 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.

Bits have a different size at each end.

Bits have a different size at each end. An opening at the tips accommodates the pin in the recess of tamper-resistant Torx screws. These are also known as pin-in-Torx bits.

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

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

Bits have a different size at each end.

Strong and durable, these multipurpose bits are for use with bit screwdrivers.

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.

When you don't have exact alignment between the fastener and the tool, the ball end allows angled entry to turn screws in hard-to-reach areas.

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.

Use with screws that have two drilled holes.

These bits have an offset cross shape. They’re also known as ACR® bits.

Also known as Reed and Prince bits.

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

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

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.

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.

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

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

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.

Turn hex nuts and cap 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 knurled shank on these bits allows finger tightening. They can also be used with the included screwdriver.

These bits are also known as nut setters.

When you don't have exact alignment between the fastener and the tool, the ball end allows angled entry to turn 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 three-winged tip fits triangular slotted screw recesses.

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.

Use with screws that have two drilled holes.

Also known as Bristol bits, these have a knurled-end shank that allows finger tightening. They can also be used with the included screwdriver.

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

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.

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

A magnetic ring at the end of the adapter holds flat-head screws in place to ensure good contact between the bit and screw. Use these adapters to hold hex-shank bits (also known as insert bits) in powered tools.

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

Insert these adapters into your SDS-drive rotary hammer to use it with hex-shank bits (also known as insert bits).

Lock your bit into the adapter to prevent accidental disengagement. These adapters attach to square-drive tools.

Store a variety of sizes and styles of bits and adapters in one compact tray.

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

These assorted shafts attach to a handle or can be used 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.

The short bit on these sockets fits in spaces where height clearance is limited.

Extra-long bits allow access to hard-to-reach fasteners.

The ball end allows angled entry when you don't have exact alignment between the socket bit and fastener.

Extra-long bits allow access to hard-to-reach fasteners.

These sockets are also known as pin-in-hex or pin-in-socket bits.

These sockets are made to withstand the high torque and force of impact tools.

Extra-long bits allow access to hard-to-reach fasteners.

These sockets are also known as pin-in-Torx bits.

The short bit on these sockets fits in spaces where height clearance is limited.

Insulated to protect against accidental contact with live electrical circuits, these sockets are tested to 1,000 volts to meet ASTM F1505 and IEC 60900.