From the world manufacturer STAHLBERG with many years of experience using the latest technologies. A practical sales set of bits and adapters that are made by precision forging (increases strength by up to 20% compared to machined ones) from S2 chrome vanadium steel (excellent in toughness), hardened to 61-62 HRC. The working surfaces have diamond grains or grooves as the most effective protection against slipping out of the bite. A gold, titanium-nitride (TiN) layer protects the bit against abrasion. The set contains 28 types of 5 or 10 pieces, the price is reduced by 5% and the plastic box is a free gift.