with 50 years manufacture history quality carbon steel 40CrV alloy steel Cross rim wrenchfeatureChrome PlatedRaw Material: 45# quality carbon steel,40CrV alloy steel Heat Treatment: Auto Temperature Control,45#:HRC39-44;40CrV:HRC42-48 Certificate TUV GS Certificate Size: ",14",15",16",20",610MM,23",25",700MM Surface Treatment: socket fully polished,handle sand blaster,chrome plated.Ni-Ni-Cr Style ...