Starrett Bi-Metal Hole Saw Kit - 6 Piece KCS06001 Cordless Smooth Cutting Hole Cutter with Arbor Set - Compatible With Bosch Dewalt Hitachi Festool MilwaukeeTOP QUALITY: HSS with high cobalt hole saws, super hardened with excellent wear resistance. EXCELLENT DESIGN: Constant pitch of 8 teeth per 25mm inch for super smooth cuts. Side grooves aid chip evacuation while flared base prevents drilling beyond the maximum cutting depth of 13mm (1 2") to avoid accidental damage. EFFICIENT: Specially designed for use with cordless power tools, CSC hole saws will cut twice as many holes as the equivalent standard