COMOWARE Cobalt Drill Bit Set- 29Pcs M35 High Speed Steel Twist Jobber Length
COMOWARE COBALT DRILL BIT SET. PROFESSIONAL & WIDELY USE: M35 Cobalt HSS is more suitable for hardened material. HSS WITH 5% COBALT: Durable, Higher Heat & Abrasion Resistance. HSS WITH 5% COBALT????? .