Cobalt Drill Bit Set- 115Pcs M35 High Speed Steel Twist Jobber Length for Har
PROFESSIONAL & WIDELY USE: M35 Cobalt HSS is more suitable for hardened material. Material: HSS M35 Cobalt 5%. All woodworkers need this set. HSS M35 with 5% Cobalt provides ultimate higher heat and abrasive resistance which ensures a longer service life.