Brake Roller / Speed Controller Dia.:80mm,92mm,120mm Material: nylon, zinc-plated Load Capacity: 500KG, 800KG, 1000KG, 1500KG We are one of the earliest and most professional Brake Roller manufacturers in China.Brake Roller Series: Dia.:80mm, 92mm, 120mm, TandemMaterial: nylon, zinc-platedLoad Capacity:500KG, 800KG,1000KG, 1500KGCheck testing video on: http://www.youtube.com/watch?v=Z7gWxgreP08 ...