Stepped Radiator Wrench and Ratchet Handle. For use on most radiator valves, caps, tank connectors, etc. Stepped Radiator Wrench: 10mm/11mm/12.5mm/16mm /21mm Graduated Radiator Wrench Type: Fits 1/2 Item: Radiator Wrench Graduated Size: Carbon Steel Practical Radiator Wrench Hand Tool Graduated Useful Carbon Steel Ratchet Handle Features: Stepped Radiator Wrench and Ratchet Handle. For use on most radiator valves, nipples, caps, tank connectors, etc. Specifications: Item: Stepped Radiator Wrench Dimensions: Stepped Radiator Wrench: / Ratchet Handle Size: Ratchet Handle: 276 x 42.3mm. Graduated radiator wrench: 10mm/11mm/12.5mm/16mm/21mm.