Material: chrome molybdenum. The heads are fully hardened with heat treatment. Chrome plated according to EN12540 standards. Manufactured according to DIN 896 standards (metric only). The key is forged from high-quality chromium-vanadium steel. It stands out for its exceptional hardness, durability, and surface protection, offering reliable and long-lasting use. It is a complete solution for tightening bolts and nuts and an essential tool for professionals and DIY enthusiasts. With the special safety cut, the keys prevent damage to the corners and edges of screws and nuts, distributing the force evenly over the surface away from the outer lines of the nut or screw head. The latest technology design enables Unior keys to guarantee precise power transmission.