The Amerex 809 Heavy Duty Vehicle Bracket is designed to work with most 10-lb. portable fire extinguishers in a variety of vehicle and marine applications. These steel brackets are primed and powder-coated to ensure many years of use, and the black finish also meets the latest UL salt spray requirements. Fits 5 to 5.25 diameter cylinders Dimensions: 7.375″W x 5.375″D x 11.3125″H Bracket Mounting Holes: 7/16″ dia.