117WR-4 Transducer Housing WrenchA single-handed wrench that holds the main thru-hull housing via the &';wrench flats&'; on the side of the housing to facilitate tightening of the hull nut. For 2" bronze and stainless steel housings (P617V, B617V, SS617V).Use wrench 117WR-2 or 117WR-3 for the hull nut.*Note that this wrench will not fit on the CA500 camera housing. Specifications: Type: Tools Box Dimensions: 1"H x 3"W x 8"L WT: 0.45 lbs