HSS Step Twist Drill Bits for Metal Drilling
HSS STEP DRILLS WITH 3 CUTTING EDGES
1, PROCESS:MILLED ROLLED,FULLY-GROUND
2,MATERIALS:HSS OR HSS-COBALT
3,APPLICATION MATERIAL:STEEL,CASTIRON OR OTHER SOFT METAL
4,SURFACE TREATMENT:WHITE,BLACK,TIN-COATED
5,SIZE:0.2-30.0mm
stub drill:DIN1897
normal drill:DIN338
long drill:DIN340,longer drill:DIN1869