Material: High Speed steel ( HSS 4241, 4341, M2, M35)
Surface treatment: black finished，polished，titanium coated，amber finished and etc
production：roll forged, fully ground
shank: straight shank
usage：drilling for stainless stee, metal, plastic , wood, poly wood and etc.
Sutable in hand drill, bench drill and etc.
HSS 4241, HSS 4341:
drilling for metal, plastic, wood and etc 。Always use roll forged, polished, titanium coated。Hardness：HRC61-63
HSS M2, HSS M35 :
drilling for Stainless Steel, metal, plastic, wood and etc 。Always use fully ground。Hardness：HRC63-66.