The Gedore 31 KR 40-80 is a heavy-duty ratchet ring spanner with an 80 mm insert ring on a 960 mm handle. The removable insert ring allows one handle to service a range of large hex sizes, giving good leverage for tightening or loosening fittings on flanges, valves and heavy machinery. Typical users include shipyards, refineries and power-generation maintenance teams working with oversized fasteners.