PONTOON BRACKET GALVANIZED 7 1/2" SLOT 8 1/2" WIDE BASE 6 3/16" TALL This bolster bracket supports your pontoon boat trailer's bunks. Constructed of corrosion-resistant galvanized steel with a sturdy base, it helps you to properly align your 6" or 8" wide bunk boards on your trailer. Dimensions: 15-1/2" long x 3" wide x 6" tall Mounting slot dimensions: 7-1/2" long x 1/2" wide This bracket holds two 2"x6" or 2"x8" bunk boards angled toward each other to provide support for one of the boat's pontoons. On both the right and left sides of the trailer, one bracket is mounted in the front and another in the rear. Carpeted bunk boards typically run from front to back.