Next, two holes are punched in what will be the right hand edge of the horizontal piece. These are to accommodate the rivets. Here is the type of punch used, one with a hollow, tapered end. The cutaway in the side allows for removal of the scrap plugs that accumulate inside the punch. It punches the holes by means of striking it with a hammer, and this is done on a designated "punch pad", which is a pad made of about 8 or 10 thicknesses of binder's board.