Material: aluminum alloyColor : RedSelection: mm type (metric)Number of tracks: 4TOTAL LENGTH: 797MMFeatures: Tracks can be spliced, clear proportions.THE TRACK FACTORY IS 797MM AND CONSISTS OF 4 PARTS: 197-497MM/497-797MM.In order to protect the track, the contact area of the lead screw is large, and the wrench can predict the position through the lead screw and will not damage the track during operation. The position of the limiter can be adjusted at will.Package includes:(1) 300MM GUIDE RAIL(197-497MM*2)(2) 300mm rail (497-797mm*2)(3) Slider *4(4) Long Phillips screw *4(5) Short Phillips screw *4(6) O-screw *8(7) T-type connector*2(8) Limiter*4(9) 153MM connector *2(10) 63MM CONNECTOR*2(11) Plastic cover *2(12) Slider *2(13) Stainless steel cover *2(14) Wrench *1(15) Phillips screwdriver*1