Size and color: about 6mm inner diameter, 10mm outer diameter, 4mm length. There are 4 beautiful colors (gold, silver, bronze, black). Each color has 100 sets. Easy to use: First, cut a hole with the hole punch and the appropriate chuck. Then take the grommet kit and other tools to fasten the grommet kit well. Wide Use: These grommets are used to reinforce holes to prevent tearing fabrics, tarpaulins, canvas, vinyl , leather and fabric. Perfect for leather, garments, handbags, curtains, repair or decoration. Premium Material: The eyelet clips are made of premium cupro nickel and surface coating galvanized. With high corrosion resistance, they are very stainless. Package includes: eyelet kit including puncher, matching mandrel and 400 eyelets (each kit contains 1 eyelet and 1 washer) and a storage box for small sockets.