material: premium chrome vanadium steel drop forged, entirely hardened and tempered surface finish: trivalent chrome plated according to ISO 1456:2009 polished head ring part with LIFE profile made according to standard ISO 7738 (metric dimensions only) Long lifespan The wrenches are made of Premium chromevanadium steel with a greater density atthe points of the highest pressure, and suchdimensioning and manufacture only increasetheir extreme power and durability. Safety cut With their special safety cut, the wrenches prevent the damaging of corners and edges of the screws and nuts by distributing the force evenly over the surface away from the outer lines of the nut or screw head instead of directly on the edges. Innovative design State-of-the art design makes Unior wrenches guarantee an accurate and efficient transfer of force to screw heads and nuts. Profiles Standards ISO 7738 Documentation Combination wrench, long type - 120/1