Strong, cast stainless steel spanner fits wide range of valves and includes bleed key. Ideal for work on radiators with square, hex, imperial and internal lug type valves. Patented design (No. 2295111) fits: 8-12mm radiator valves and 8mm extension valve fittings; 1/2" imperial and imperial internal lug type valves; metric internal lug valves; thermostatic valves; 1/2" black iron plugs; 1/2" air vent plugs and 1/2" plastic plugs.