SPECIAL DESIGNED EASY REMOVAL AND REPLACEMENT OF GLOW PLUGS. 3/8" DR., 6 POINT TYPE SIZES: 8 / 9 / 10 / 12 / 14 / 16MM WITH UNIVERSAL JOINT MATERIAL:CRV, LENGTH: 85MM. FORGED CHROME VANADIUM STEEL UNIVERSAL GLOW/SPARK PLUG SOCKETS. HEAT TREATED WITH A SATIN FINISH. DOUBLE-PIN TYPE UNIVERSAL JOINT. RUBBER SOCKET INSERT GRIPS CERAMIC INSULATION AND ASSISTS IN EXTRACTION OF PLUG.