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:Hardened and tempered Chrome Vanadium steel sockets.Fully polished mirror finish with knurled ring.Socket insert grips ceramic insulation and assists in extraction of plug.Especially useful on deep-seated plugs.Lifetime guarantee*.Model No. S38SP10 Specifications: Model No S38SP10 Brand: Premier Depth: Deep Drive: 3/8''Sq Material: Chrome Vanadium Nett Weight: 0.10kg Size: 16mm