Box contents: 1 piece of painted steel turntable for boat seat with locking lever locking lever with ergonomic handle 360° rotation, 12 positions 360° rotatable, 12 positions dimensions: swivel plate 17.5 x 17.5 cm, width including lever, 18.8 cm, distance of the drill holes (hole centre to hole centre), 13.5 cm total height. 2.5cm