361T-Box-Ring-Immersion-Heater-Spanner-Monument-361T-p-The-Monument-361T-Box-Ring-Immersion-Heater-Spanner-is-made-with-an-octagon-at-the-base-of-the-cylindrical-section-to-enable-really-tight-immersion-heaters-to-be-loosened-by-striking-the-handle-p-p-The-one-piece-casting-enables-full-transmission-of-power-to-the-spanner-unlike-loose-tommy-bar-types-Overall-clearance-around-the-spanner-is-7-8in-22mm-allowing-easier-fitting-on-insulated-copper-cylinders-p-p-Made-in-Britain-p-