Material handling system:The chains on this line, with the tension up to 1250N, coordinated with the patent technology are able to drive long delivery distance using a single driving unit. The curves of the line can bear the accumulation of materials; the chain with the ball bearing reduces the friction and prolongs its lifetime. The buckle-mounted and symmetric sliders are easy to install and can be reused with the direction reversed when they are worn. The wide chain plate can protect itself from the outside obstruction when it comes back, so it is not necessary to use a central chain to lead rail.