21mm Spark Plug Socket3/8" Square DriveCar Engine Maintenance Nut Toolcold-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 XXXFeatures: Hardened and tempered Chrome Vanadium steel socket. 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 . Specification: Depth -Deep Drive -3/8"Sq Material -Chrome Vanadium Net Weight -0.14kg Size -21mm Further Information We sell a wide variety of tools and workshop equipment for both the DIY and Professional markets. Alias: ys07447 Loops 21mm Spark Plug Socket - 3/8" Square Drive - Car Engine Maintenance Nut Tool