Davits are made out of hidensity density poly propylene.1" thick.over all length is 48" long. you can Agust the cradel in any position you want. bottom cradel is 2" wide for more seport.each davit seat have a total of 32 rollers.all hardware is countersunk in plastic. 5/16 pin that's  locks it in up position. off set brackets are 1"1/4 x 1"1/4 x 3/16 wall thickness stanles steal. comes with all mountain hardware and backings plats. 600lbs load rating. please  call be for ordering witch your swim platform meserments so I can give you the right length off seat brackets or technical questions call rick at 1586 588 1779