Easy assembly and the added strength of a 1000 lb shelf capacity. Boltless 13-gauge compression clips make adding and removing shelves a snap. Shelf corners are fully lapped and welded in two places for extra strength. Shelves can be adjusted quickly and easily in 1-inch increments to make maximum use of vertical space. Medium-Duty Industrial Clip Shelving systems container six adjustable shelves. Posts are made of 14-gauge rolled steel and shelves are constructed of 20-gauge steel.