Letter Jobbers' Drills | McMaster-Carr

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System of Measurement

Letter Size

Length Class

Jobbers

Drill Bit Size

For Use On

Decimal Size Equivalent

Finish

Titanium Aluminum Nitride (TiAlN) Coated

Titanium Nitride (TiN) Coated

Drill Bit Point Type

Material

Point Angle

Flute Direction

Shank Size

Shank Type

Sold As

Overall Length

Maximum Drilling Depth

Flute Type

Number of Flutes

Bit Style

Fluted

Number of Pieces

115

Drill Bit Sizes Included

1/16"-1/2" (increments of 1/64")

Export Control Classification Number (ECCN)

REACH

RoHS

DFARS Specialty Metals

Specifications Met

Container Type

398 Products

About Drill Bits

Compare material, finish, length class, and decimal size equivalents.

Drill Bits

These jobbers'-length bits have the rigidity and length required for most applications.

Cobalt Steel Drill Bits

Chip-Clearing Cobalt Steel Drill Bits

The parabolic spiral flutes lift chips out of the hole, reducing clogging and improving coolant flow.

Carbide Drill Bits

These jobbers'-length bits have the rigidity and length required for most applications.

Smooth-Finish Carbide Drill Bits

Three cutting edges instead of the typical two enable these bits to drill holes with a smoother finish than other bits.

Carbide-Tipped Drill Bits

These jobbers'-length bits have the rigidity and length required for most applications.

Drill Bits for Carbon Fiber, Fiberglass, and Graphite

These jobbers'-length bits have the rigidity and length required for most applications.

Drill Bits for Plastic

The sharp point allows for gradual penetration to reduce friction and eliminate cracking and chipping when drilling in plastic.

Drill Bit Sets

These jobbers'-length bits have the rigidity and length required for most applications.

Cobalt Steel Drill Bit Sets

Left-Hand Drill Bit Sets

Also known as reverse-flute bits, the flutes spiral in the opposite direction of other bits. Use in counterclockwise drilling applications such as removing broken screws.