10-100x Cobalt Drill Bits HSS Ground Flute For Stainless & Hard Steels. SPECIFICATION: Product Name: Cobalt HSS Drill Bit Type : Drill Bit Diameter :1mm-13mm Drill Bit Material :Cobalt Manufactured : DIN338. 3.3MM, 3.5MM, 4MM, 4.2MM, 4.5MM. 5MM, 5.5MM, 6MM, 6.5MM, 6.8MM, 7MM. 7.5MM, 8MM, 8.5MM, 9MM, 9.5MM, 10MM. Full ground from solid material High heat resistance For hard material processing M35 alloyed HSCO 5% Cobalt Manufactured to DIN338 Tip angle 135? For faster drilling. 5-100 Piece Set Cobalt HSS Drill Bits.