29171 Type 130-D 1/2" Reduced Shank Silver & Deming Super High-Speed M42 Cobalt 135Â degree Split Point Drill Bit 6.437" ID This is commonly known as

This is commonly known as a "red rubber hose

TENV Non Ventilated & TEFC Fan Cooled

The spline design virtually elimi nates back lash which is a delayed action effect caused by excessive clearances between hub and discs

All Boston Gear change gears are manufactured with a double key to accept the compound steel bushings that connect two gears together

Coil Insulation & Protection Class H Class IP65

29171 Type 130-D 1/2" Reduced Shank Silver & Deming Super High-Speed M42 Cobalt 135Â degree Split Point Drill Bit 6.437" ID This is commonly known asHeavy 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