The System X Storage pegboard holes are fully threaded (5/16-UNC) giving all accessories unmatched stability because they are held in place with screws. The 273 holes across the pegboard surface give ample choice in bracket placement. The threaded holes guarantee your brackets are secure and will not fall off when you move your items on and off the pegboard. The material has a thickness of 18 gauge giving it great strength and durability and the stainless surface has a high quality finish to fit with ease anywhere in the garage or home. With 4 return flanges that sit flush on your wall the System X pegboard is made to handle high loads. The System X pegboard can be easily mounted in a portrait or landscape configuration as the accessories will attach in either direction. Heavy duty shelves are available for either landscape or portrait setups. Additional pegboards can be nested next to or above existing ones to create a larger storage area. Comes with quality stainless steel mounting hardware.