The Whitecap Teak Swim Platform with 1-Step Ladder is designed specifically for use on boats with inboard/outboard motors. 304 stainless steel mounting hardware included. Assembly required. Dimensions: 18âW (back) x 17âW (front) x 15âD x 1-5/16â thick. MPN#: 67903. 304 stainless mounting hardware included Measures 18"W (back) x 17" W (front) x 15" D x 1-5/16" thick | Teak Swim PLATFORMm, 1-Step Ladder for Boats with I/O Motors