uxcell 10 x High Speed Steel Double Ended Countersink Center Drill Bit 1mm Product Name : Center Drill Bit;Diameter : 1mm / 5/128" Shaft Diameter : 4mm / 5/32";Total Length : 36mm / 1.4" Material : HSS;Color : Silver Tone Weight : 35g Package Content : 10 x Center Drill Bits,1 x Case