The 29-pc Pyramid Point Drill Bit Set, No. 6629DSA, from Mac Tools is made from durable M35 Cobalt steel for drilling through materials including stainless steel, hardened alloy, grade 8 fasteners, and cast irons. The pyramid point design acts as a self-centering step drill for precision without walking on curved surfaces. The tri-flat shank design on 1/8" and above helps to eliminate slippage. Sizes range from 1/16" to 1/2" to accommodate a wide variety of light and heavy duty applications.