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DRILL HARD ALLOYS WITH COBALT: This 13-piece HSS cobalt drill bit set covers 1.5-6.5 mm, so one steel box handles fine pilot and clearance holes in steel, cast steel and hard alloys with fewer worn bits 5% COBALT HSS STEEL: High-speed steel alloyed with 5% cobalt gives an increased lifespan, and the polished surface with h8 precision class supports accurate, clean holes in hard materials for daily workshop use TECHNICAL DATA: 13 sizes from 1.5 mm (0.06 in) to 6.5 mm (0.26 in), DIN 338, h8 precision class, C-cut to DIN 1412 with 135 degree split point, drilling depth up to 5xD for continuous holes and pocket holes HAND AND PILLAR DRILL USE: Suitable for hard alloys, cast metals, steel and cast steel in workshops, garages and fabrication, using a hand drill or a pillar drill, with a split point that centres starts TRUSTED SINCE 1998: S&R has been established in the UK since 1998 and backs the highest quality level of these drill bits with a 10-year guarantee, because that promise shows our confidence in every set