Drill America 28-Piece Tungsten Carbide Set Cutting Bit Accessory KitRemoves material in wood, plastic, stainless steel and metals Double cut style for rapid material removal in tough applications Solid carbide tooling provide long life and faster cutting speeds Round 1 4 in. shank allow use with a wide variety of tool holding systems 28 Piece Set Features Sub Brand Drill America CA Residents: Prop 65 Warning(s) Yes Diameter Measurement Set For Use on Glass No For Use on Wood Yes Total Number of Pieces 28 Warranty None