High Density Chrome Wire Shelving Sliding Track System offers a unique way to maximize and efficiently move Wire shelving systems. The patented design allows for quick and easy installation. Bearings in the skate are located under each post for a load capacity of 1,500 lbs. per shelving unit. The V-groove floor track allows the shelving unit to slide back and forth with ease. Step by step ordering instructions: (Note: Shelves and posts to be purchased separately) Step 1 - Select desired length (in inches) of track. Use Model No.: QVTRK to order track. (Note that single units require two tracks and double units will require three tracks) Step 2 - Select corresponding skate size from the chart, which will be the same as the depth of shelving unit to be utilized. Two skates required per single unit and three skates required per double unit. (Note, post height should not exceed a 4 to 1 ratio of skate size) Step 3 - Purchase one End Stop Kit (Model No.: QESTP) per track length. For each double unit being used, a Wing Kit (Model No.: WK) is required.