Cleveland Golf C13234 #21x12 In pneumatic accessory

Extra Long Drill Bit #21

This extra long drill bit is sized at #21 and built from high speed steel for machining high performance applications. It features a 135 degree split point that aids accurate starts in wire and similar materials. The bright uncoated finish suits general purpose drilling tasks. It is designed for users who need extended reach in a single tool.

Fits standard drill chucks

The straight shank fits directly into standard drill chucks without requiring a special adapter or collet. Its 12 inch overall length frees up access to deep holes that shorter bits cannot reach. The 4xD design supports a maximum drilling depth of 5/8 inch per pass. Builders who need a second bit for different diameters or a coated variant for abrasive alloys will need additional tooling.

HSS construction handles sustained cutting

High speed steel construction maintains hardness during sustained cutting cycles better than carbon steel alternatives. The split point geometry reduces thrust load, limiting heat buildup during repeated passes. The bright finish offers no thermal barrier, so operators must manage coolant or peck cycles in deep holes. Users seeking longer tool life in high temperature alloys should consider coated options not provided here.