The backplate, a plate, usually made out of stainless-steel, at times aluminium or carbon fibre composite, that is held towards the diver's back from the harness, and also to which the diver's Key cylinder or cylinders are attached. DIVEIN has long been screening underwater scooters for numerous a long time, http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=3318890