Check the listing for details. Micron #3 (7/16") Iron Nickel Self-Piercing Grommets & Washers, 500 Pcs Set. Condition: New. Listed at 13.20 USD. Includes#3 (7/16) Iron Nickel Self-Piercing 500 Grommets + 500 Washers. GrommetsEverything about our eyelets are superior. The heavy-duty iron, the quality of finish, and the value for your money. Grommet Mart's Self-Piercing Grommets are made from heavy-duty iron. When set with their matching washers, they pierce and set in a single action without the need for a pre-punched hole. Since we carry a large inventory of grommets and washers in stock, even orders calling for popular finishes will be in stock and ready for immediate shipment.Notes*Micron grommets only work with Micron machines and dies.*Self Piercing Grommets do not cut through webbing, polyester, and elastic materials. Hole piercing die is required. *#3 Self-Piercing Grommets and #3 Self-Piercing Grommet dies are compatible with any of the micron machines, TEP-1, TEP-3, DEP-2, M-3, Pl-10, and MC-20 machines.