Material:Stainless Steel, Alloy Steel, Cobalt. Cutting Angle String:135 Degrees. Super Premium Solid Cobalt M42+ Steel. 1/16″ to 1/2″ by 1/64th Increments (Does Not Skip any Sizes). 135 Degree Split Point Prevents “Walking”. Tri-Flat Shank Prevents “Spinning” in the Drill Chuck.