The Bahco Radiator Valve Ratchet Set for installation and removal of heating valve nipples, tank connectors and short tap extensions. It comes with all the fittings, covering from small to large. Stepped along the length of the key for different internal hexagon and internal lug valve sizes. All components in the set have a chrome plated surface finish. Contains: 1 x Ratchet, 1 x Square Drive and 1 x Stepped Key in a practical plastic pouch. Conforms to ISO 3315 / DIN 3122 / ISO 1174-2 / DIN 3120 Sizes Covered: 3/8, 7/16, 1/2, 3/4 & 1in