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This Monument radiator valve spanner is a zinc plated steel spanner that has a comfortable, slightly offset, handle. It is perfect for 3/8 inch and 10mm square section radiator vent plugs, bleed screws, and 5.5mm profiles for Lockshield valves.Features & Benefits: Monument Radiator Valve Spanner, Hexagon: 1/2 inch 12.7 mm, Zinc plated, Comfortable, slightly offset, handle, For 3/8 inch and 10mm square section radiator vent plugs, bleed screws, and 5.5mm profiles for Lockshield valves. Monument Radiator Valve Spanner Monument 2053U