Forged chrome vanadium steel sockets with double-pin type universal joint. For diesel glow plugs and petrol spark plugs. Rubber socket insert grips ceramic insulation to assist in plug extraction. Socket sizes: 8, 9, 10, 12, 14 and 16mm. Supplied in tough storage case. Forged chrome vanadium steel sockets with double-pin type universal joint. For diesel glow plugs and petrol spark plugs. Rubber socket insert grips ceramic insulation to assist in plug extraction. Socket sizes: 8, 9, 10, 12, 14 and 16mm. Supplied in tough storage case.