Edsal WorkForce heavy duty steel storage rack with 5 shelf. Assembly is done with the rivets of the beams and braces fitting into the slots of the post. A rubber mallet may be used on the beams and braces to seat the rivets properly. A hammer can also be used, providing one uses a cloth or a block of wood between the hammer head and the parts to prevent damage. Tap gently and be sure the rivets are straight and fully engaged.