material: premium chrome vanadium steel drop forged, entirely hardened and tempered surface finish: phosphated to standard ISO 9717 left turning with scale made according to standard ISO 6787 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. Documentation Adjustable wrench - 251/4