Specification: ​①.4-12X5(4-6-8-10-12) ​②.4-12X9(4-5-6-7-8-9-10-11-12) ​③.4-22(4-6-8-10-12-14-16-18-20-22) ​④.5-23(5-7-9-11-13-15-17-19-21-23) ​⑤.4-32(4-6-8-10-12-14-16-18-20-22-24-26-28-30-32) ​ ​Material:HSS M35 Co ​ ​Coated:TiAIN ​ ​Blade:3 Flutes ​ ​Handle:6.35mm(1/4" shank) ​ ​3 Flutes HSS-CO M35 Spiral grooved Step TiAIN Drill Bits Cut Tool Set. ​TIALN PLATING to reduce mit and run cooler. ​Automatically deburr holes as you drill. ​Widely used to cut holes in a variety of material like stainless steel tapping steel, wood, thin iron, aluminum alloy, moisture boards, PVC sheet, ect.