The 23” Rack Shelves has a capacity of 100 lbs (45.36 kgs) and adjustable mounting from 11 – 31.5” (279 – 800 mm). It’s made from 14 GA steel. The shelf can be mounted in the center or flush. 2 Post offers a variety of sliding or fixed shelves for 2 Post racks. They are able to withhold weight from 30 lbs (14 kgs) to 900 lbs (408 kgs). Also the shelves are compatible with threaded, square, or round hole racks, while giving an adjustable mounting depth. 2 Post shelves are designed to hold all types of equipment in any size or weight.