From the world manufacturer STAHLBERG with many years of experience using your website. Practical sales set of bits and adapters, which are made of precision fittings (you have the strength of up to 20% of your machine tools) from chromium-vanadine steels S2 (excellent toughness), hardened to 61-62 HRC. There are diamond grains or grooves on the work surfaces as the most effective protection against slipping out of engagement. The 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. [***]