They are manufactured to Aerospace Standard 907 and display high red hardness, permitting speeds up to 30% greater than with conventional M2 high speed steel....
Cobalt Drill Bit Set, 115Pcs M35 High Speed Steel Bits for Hardened Metals, Stainless Steel, Cast Iron and Wooden Plastics, with Metal Index Storage Box....
115 PIECE PREMIUM QUALITY COBALT DRILL BIT SET. THESE ARE NOT COATED DRILL BITS. THE REAL McCOY COBALT DRILL BITS. CUTS CAST IRON-HEAT TREATED STEEL-STAINLESS...
115 PIECE PREMIUM QUALITY COBALT DRILL BIT SET. THESE ARE NOT COATED DRILL BITS. THE REAL McCOY COBALT DRILL BITS. CUTS CAST IRON-HEAT TREATED STEEL-STAINLESS...