1. HSS drill bit sets have extremely high hardness, in the drilling work has excellent processing performance,
all grinding sharp ligament sticky milling work hole smooth no burr. 2. With good toughness of materials, wear resistance and drilling ability, the drill bit set tools apply to cast iron,
copper and aluminum die steel alloy steel. 3.Gold-oxide coating resists heat build-up and lengthens bit life. 4.Removable cartridges: easy to carry bits from case to worksite. 5.Suitable for a range of electric drills and drilling machines thanks to our straight shank design.