comoware cobalt drill bit set- 115pcs m35 high speed steel twist jobber length for hardened metal, stainless steel, cast iron and wood plastic with metal indexed storage case, 1/16" - 1/2" comoware <p><b>specifications:</b></p> <p>material: hss m35 cobalt 5%</p> <p>angle point: 135 degree</p> <p>flute type: spiral</p> <p>shank type: straight shank</p> <p> </p> <p>all woodworkers need this set. 115 pieces are included for you to choose the most appropriate one, and it comes in a portable case. and all drills can be used for cutting metal, plastic, wood, etc. hss m35 with 5% cobalt provides ultimate higher heat and abrasive resistance which ensures a longer service life. </p>