The Monument 2052R Universal Radiator And Valve Key Features Tapered Ends That Are Self-Restricting. With Three Profiles, This Tool Is Versatile And Can Be Used With 3/8in And 10mm Square Section Radiator Vent Plugs And Bleed Screws. It Can Also Be Used With Bayonet Or Internal Lug Type Radiator Valves, Accmmodating Variations In Size, Shape, And Position. In Addition, The Tapered Design Of The 12mm To 14mm Internal Hexagon Valves Allows For Flexibility In Size. In Addition, The Tapered Design Of The 12mm To 14mm Internal Hexagon Valves Allows For Flexibility In Size. Made In Britain, Weight: 0.440924524 Pounds, Manufacturer: Monument