Made from 3/8" galvanized steel. Supports 2" x 6" and up to 4" x 8" bunks. Base: 2-1/2"W with two 7/16" mounting holes on each tip. 8" long arms have a 7/16" mounting hole on each tip. 15-3/4"W from tip to tip. 5-1/8"H when mounted. To be used with 24"dia. pontoon. It's recommended that brackets be placed 18" to 24" apart on your bunks for proper support. Two 7/16" mounting holes on base One 7/16" mounting hole on each arm 15-3/4"L wing span x 2"W | Galvanized Pontoon Bunk Bracket