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. The Configurable 2 Post Rack Shelf - 20” has a surface area of 13” x 17.375” (330 mm x 441 mm) and can hold up to 150 lbs (68 kgs). It can be mounted up-side-down and is made from 16 GA steel and the shelves can be recessed/ extended in 1” increments.