Safco Boltless Steel Shelving, 5 Shelves, Black: * Safco Boltless Steel Shelving. Unique steel shelving requires no nuts or boltsassembles in minutes without tools!. Versatile design allows two different set-ups: a five-shelf, 72" high storage unit, or a 36" high sturdy workbench * Unique steel shelving requires no nuts or boltsassembles in minutes without tools! * Versatile design allows two different set-ups: a five-shelf, 72" high storage unit, or a 36" high sturdy workbench