Brake Roller / Speed Controller Dia.:80mm,92mm,120mm Material: nylon, zinc-plated Load ... watch?v=Z7gWxgreP08 Brake roller(also called speed control roller), is very important in the gravity racking. It could make ... /s), avoid the impact caused by sliding down in too high speed to the rack and goods, so as to ... if you have any question or need samples! Speed Controller in Gravity Pallet Rack Brake Roller