Designed to work with most 20 lb. and 30 lb. portable fire extinguishers with a cylinder diameter of 7.75" to 8" in a variety of vehicle and marine applications Amerex fire extinguisher brackets are quality manufactured of steel with a primed and powder coated paint finish The paint finish assures many years of use and meets the latest UL salt spray requirements (240 hrs. @ 20% salt solution – ASTM B117) Fits Amerex Models: B570, B571, 567, 568, 569, 589, 591, 332 Holds extinguishers with a cylinder diameter of 7.75" to 8" Also works with Badger, Ansul, Buckeye and other fire extinguishers with the same cylinder diameter Dimensions: 9.75" W x 8.125" D x 17.5" H Bracket Mounting Holes: 7/16" dia.