outside motor, roller door motor, 300kg,500kg,600kg,800kg,1000kg,1300kg,1500kg,2000kg,2500kg ... is used for open and close the rolling door of industrial door, commercial door, supermarket door, storehouse, cinema, and hotel and so on. It ... lock switch,bearing and mounting bracket,supporting bracket, driving plate,large chain wheel, chain and square bracket. 2.with dry battery ...