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This UNI spanner ratchet set from Rothenberger is for the easy installation and removal of heating valve nipples, tank connectors and short tap extensions. It is made from chrome vanadium steel with a hardened, nickel-plated, square drive 1/2.Features & Benefits: Rothenberger Uni Spanner Ratchet Set, Universally applicable: cam, internal hexagonal and 12-edged driver, size 3/8 - 1/2 - 3/4 - 1 and other sizes in between, No canting of nipples and screw connections with the special stepped key design, Combination key allows installation and removal of heating nipples, tank connections and short tap extensions, 1/2 Ratchet makes installations quick and easy. Rothenberger Uni Spanner Ratchet Set 73297