This a T-RAIL for a chamberlin,liftmaster or sears craftsman. chain drive 7FT model that uses a CHAIN &CABLE COMBINATION model it includes the nuts bolts and screws to assemble. This does not include the carriage,trolley or chain.these items sell separately see my other items listed. This item is used it has be cleaned and checked for useability and wear. It is in excellent condition. The picture shows a 4 piece rail actual item shipped could be either the 4 piece or the 3 piece they are interchangeable with each other.