These precision ground HSS drill bits, with black flutes, are designed principally for drilling larger holes in ferrous and non ferrous metals. They each have a characteristic shank machined down to ½"...
The CHT384 Clarke Drill Bit Set are cobalt steel drills which offer higher heat and abrasion resistance compared to HSS drills, making them more suitable for use on hardened steel, super alloys, titanium...
The CHT383 Clarke Drill Bit Set are cobalt steel drills which offer higher heat and abrasion resistance compared to HSS drills, making them more suitable for use on hardened steel, super alloys, titanium...