Robustness and longevity: Silicon alloyed steel keys to combine strength and stamping endurance Assured safety: Precise and constant heat treatment for maximum hardness ensuring that the key is twisted before it breaks cleanly and without splintering Perfect contact with the screw: truncated and unsheared keys allowing for a face free of burrs or irritability Phosphate finish for a sober and clean style French manufacture: This wrench is manufactured in our screwdriving factory in Arbois in Jura, Weight: 0.551155655 pounds, Manufacturer: Facom