HSS Cobalt Step Drills Bit High Speed Steel Nitrogen Spiral Triangle Shank Drill Bit Set for Metal Cone

HSS Cobalt Step Drills Bit High Speed Steel Nitrogen Spiral Triangle Shank Drill Bit Set for Metal Cone

No need for a pilot hole;Titanium coated to reduce friction and run cooler Large bit has 3 sided shank. Automatically deburr holes as you drill High speed steel,durable.

Specification : Color : Black Gold Silver Material : High Speed Steel(HSS) Surface : Nitrogen treatment (increasing the hardness and abrasion resistance) Shank:Triangle round handle Scop : thin iron plate,aluminum,insulation panels,PVC panels 4mm thickness within the timbe