Cold-forged Chrome Vanadium steel socket. Hardened, tempered and chrome plated. Fully polished mirror finish with knurled ring. Socket insert grips ceramic insulation and assists in extraction of plug. Especially useful on deep-seated plugs. For other variations of individual Spark Plug Sockets, see page XXX. Features & Benefits:Cold-forged Chrome Vanadium steel socket.Hardened, tempered and chrome plated.Fully polished mirror finish with knurled ringSocket insert grips ceramic insulation and assists in extraction of plug.Especially useful on deep-seated plugs.Lifetime guarantee*.Model No. S12SP14 Specifications: Model No S12SP14 Brand: Premier Drive: 1/2"Sq Material: Chrome Vanadium Nett Weight: 0.14kg Size: 21mm