Drill 12 pieces titan coated HSS twist drill made from 9341 steel HV2000 Drill 17pcs12 pieces titan coated HSS twist drill made from 9341 steel HV2000. 1,5-2,0-2,5-3,0-3,2-3,5-4,0-4,5-4,8-5,0-5,5-6,0 mm. 5 pieces carbide metal assembled stone drill 3-5-6-8-10 mm with YG8 plate, durability HRC91.