The Scotty 4577 Fire Coupler Spanner and Gas Wrench is a durable, light weight wrench used to tighten and loosen 1" (25mm), 1-1/2" (38mm), 1-3/4" (44mm), 2" (51mm) 2-1/2" (65mm) and 3" (76mm) fire hose line couplers, swivel hose fittings and anvil lug couplers. The tool can also be used to open standard, 70mm caps on foam concentrate containers. There are two different sized slots incorporated into the wrench for use as a gas cock shut off. The 4577 is made from incredibly tough, glass-filled nylon, comes in a high visibility yellow color, is spark and corrosion proof and includes a quick snap belt clip. When purchased in quantities of 500 or more, each wrench can be affixed with a custom made dome label showing a logo, website and/or telephone number. The wrench can be molded in virtually any color, minimum quanities apply. The 4577 wrench is 7-1/2" (190mm) long and weighs just 2-3/4 oz (79g).