Eyelets are metal rings, usually made of Brass, aluminium or iron which serve as reinforcement to a hole in fabric or paper. Eyelets are metal rings with a flange surrounding the hole. The flange extends into a barrel that is inserted through a hole in the material and set by hand or machine. The barrel either rolls or spreads out, grabbing the material and strengthening the hole. Eyelets are set using a variety of tools and machines. The simplest method is using a hand setting tool and hammer. For setting a large quantity of eyelets uniformly and quickly, there are machines available, from simple hand press machines, to heavy duty setting machines. To set eyelets by hand, first punch a hole in the material. Insert the eyelet with the barrel pointing up. The flange side of the eyelet should be on the side that will show. If using a washer for better strength and grip, slide it over the barrel. Next, insert the setter tool in the end of the barrel and tap it with the hammer. Tap until the barrel rolls over or spreads out flat onto the material.