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. Assembly kit consists of a pair of aluminum tracks with end stop kits. Hardware and assembly instructions included. Ordering Instructions: (Note: Shelves and posts to be purchased separately) Step 1 - Select desired length of track and if you require: Single Unit track or Double Unit track Step 2 - Select corresponding skate size for single or double units. Skate size should match the depth of shelving unit being utilized. (Note, post height should not exceed a 4 to 1 ratio of skate size) Step 3 - Determine how many shelving units will fit on your track. Step 4 - Preconfigured 4-Shelf Wire units are available, sold separately.