ITEM NAME:7pcs/set 6mm-19mm HSS Chamfer Drill Bit Countersink Chamfer+Center Punch #gib Store Home Promotion Hot Item Add to Fav.6 X Countersink Chamfers. Material: HSS, Alloy. Paper cutter: 6mm / 0.23 ", 8mm / 0.31", 9mm / 0.35 ", 12mm / 0.47", 16mm / 0.63 ", 19mm / 0.75". 1 / 4 "hex shank is suitable for most hand-held and fixed drills.