Master Mechanic, 716 x 512, High Speed Steel Black Oxide Drill Bit, Jobber Length, 38 Shank, 135 Point Angle With 4 Cutting Edges Eliminates Walking Provides Fast Penetration, Black Oxide Tempering Treatment Reduces Frictional Resistance Improves Chip Flow, Recommended For Wood, Plastic, Wallboard, Plywood, Soft Metals, Aluminum, Brass Bronze, For Occasional Use In Stainless Steel Other Hard Metals, Carded