Material: The metal grommets eyelets kit is made from copper, which makes these eyelets and washers hard, rust, corrosion-resistant, and durable. Each set includes an eyelet and a washer, ensuring stability without easy damage or cracking Easy to Use: Mark the center point of each grommet hole, Use a tool to create a small hole. Place one side of the grommet through the front side of the hole. Put the washer on the back of the hole, and gently tap the tool with a hammer to secure the grommet. Wide Applications: Our metal eyelets are suitable for various repair and craft projects including repairing tents, tarps, canvas, and clothing, or making crafts, fabrics, leather, bags, and shoes. Inner Diameter: 4mm/0.2inches Outer Diameter: 8mm/0.3inches Thickness: 4.4 mm/0.2 inches Package Content: 100 sets of Metal Grommets Eyelets Kit