QUANTITY: The grommet tool kit includes a hole punch, a matching mandrel, and 100 sets of grommets (each set includes 1 grommet and 1 washer) and a storage box. WIDE APPLICATION: These durable tarp grommets are suitable for denim, canvas, tarps, tents, awnings, and other fabric items or other materials with a thickness of less than 1 mm. EASY TO USE: The grommet kit makes installation easier. First, use the hole punch tool to make a hole in the tarp (fabric), then take the grommet set, and finally fasten the grommet set with the included tool. Place a rubber mat or a wooden board when making holes to prevent the hole punch from becoming dull. HIGH QUALITY: Made of high-quality copper-nickel and electroplated surface, with very good corrosion resistance and bright appearance, not easy to rust. SIZE: Inner diameter: 12 mm (1/2 inch) and outer diameter: 21 mm (5/6 inch). With a plastic storage box, approx. 17.5 x 9.9 x 3.3 cm. Grommet kit, 12 mm Grommet kit Metal tool set Grommets 100 sets Grommet kit for tarps Sewing Canvas Tarp Tent Grommets Set 12 mm Grommet kit Grommets Tool Metal Grommet kit Grommet 100 sets of grommet eyelets, a black cutter, in a transparent storage box. The buttonholes are made of high-quality metal. Durable buttonholes ideal for canvas, tarps, tents, awnings, belts, clothes, wallets, bags, and other fabrics. The inner diameter of these copper grommets is approximately 12 mm (1/2 \"), the outer diameter is 21 mm (5/6 \"), the height is 5 mm (1/5 \"). How to use it? Punch the hole with a hole cutter->Press the grommet into the hole->Place the gasket on the grommet->Fasten it with a hammer. Tips Some parts of the product are sharper. Wear gloves and protect your hands during use SPECIFICATIONS: Material: Copper Color: Silver Inner diameter: 12 mm (1/2 \") Outer diameter: 21 mm (5/6 \") Quantity: 100 sets PACKAGE INCLUDED: 100 sets of grommets 1 x punch 1 x base 1 x installation rod NOTE: Do not punch holes in thick materials. Use it carefully to avoid injury!