Supplied as kit of parts, Hepcomotion MHD has bearing blocks and tracks as 2 basic elements. Kits come with set of 4 bearing blocks, each with 3 integral crowned rollers that are sealed for life of product. Bearing blocks run on pair of 100 x 40 mm flat tracks and are available in single lengths of 1.4 m. Tracks can be butted together to meet any length requirement.