Robust and durable: the production of solid metal makes the body of the impact control HSS Fried Dough Twists drill extremely solid. High durability: precision grinding of spiral grooves reduces wear during drilling. Spiral drills have a long service life. Accuracy: Active cutting, low contact force, and perfect alignment thanks to the split bit tip. Usage: Very suitable for alloy steel and non alloy steel, cast iron, sintered iron, non-ferrous metals, metal plates, and plastics. Suitable for all impact drills, drill bits, and drill bit brackets installed with hexagonal shanks.