29221 Type 130-D 1/2" Reduced Shank Silver & Deming Super High-Speed M42 Cobalt 135Â degree Split Point Drill Bit 6' Extension Boston Gear’s stem pinions feature

Boston Gear’s stem pinions feature small numbers of teeth that are cut integral to the steel shaft

Even in Cold Environments

is UV stabilized

Click here for spec sheets: BUCNPHA Spec Sheet

29221 Type 130-D 1/2" Reduced Shank Silver & Deming Super High-Speed M42 Cobalt 135Â degree Split Point Drill Bit 6' Extension Boston Gear’s stem pinions featureHeavy duty 135 degree split point with gold finish for use in drilling hard tough metals, free machining stainless steel, high temperature alloys, titanium and certain plastics. High red hot hardness of cobalt steel permits speeds 30% higher than regular high speed steel drills. Cobalt drills require rigidly held, positive feed drilling equipment. Click Here for product catalog Proudly Manufactured in the U. S. A