Master Mechanic, 7 Piece, M42, High Speed Steel, With Cobalt, Drill Bit Set, Contains 1/16", 3/32",1/8", 5/32", 3/16", 7/32", 1/4", 135 Split Point, Jobber Length, 135 Split Point Angle With 4 Cutting Edges, Eliminates Walking & Provides Fast Penetration, 8% Cobalt Content Provides Heat Resistance & Delivers Maximum Cutting Efficiency At Temperatures In Excess Of 1000&degree. F, Heavy Duty, Recommended For Drilling Hard Metals Such As Heat Treated Steel, Stainless Steel, Chrome, Manganese Steel Plus Titanium & Armor Plate.