din911 standard allen key, made of carbon steel, nickel plated. size- M4 strength-HRC48-55 DIN911 Carbon Steel Allen KeyMaterial : CS , SS , Alloy SteelSize : M1.5 ... .8 , 8.8 , 10.9 , 12.9 Finish : Plain , Zinc Plated , YZP , HDG , Dacrotized etc. hex wrench, used to twist turn ... , please sent e-mail to us , get more information DIN911 nickel plated Steel Allen Key