This kit is constructed of steel and plastic components and it includes all the parts necessary to repair one wooden drawer track system. Track is constructed of a 22-1/2 in. piece of rolled-edge galvanized steel that can be cut down to size. Roller assemblies are constructed of steel brackets with plastic wheels. The guides are constructed of plastic. Rollers are used to replace worn or missing parts, The rollers install into the inside lower left and right corners of the drawer.