Master Mechanic, 716 x 12, Extra Length, High Speed Steel, Black Oxide Drill Bit, 135 Point Angle With 4 Cutting Edges Which Eliminate Walking Provide 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