... Bit 2. manufacturing process: fully ground 3. surface finish: bright H. S. S Twist Drill Bit1. Description: HSS TWIST DRILL BITS SET 2 ... easy.Suitable for drill design in high hardened tough materials, i.e, heat treated steel, titanium alloy, stainless steel, incoroy inconel ... , sds drill bit set, wood drill bit and so on. H. S. S Twist Drill Bit