Easy to operate: Align the pliers with the material where you want the hole to be, then press down the Plier Handle to make a small hole. Put the eyelet in place and use the pliers to press the grommets into the material, which locks the eyelet in place. METAL GROMMET KIT - You will get 1 piece grommet hole punch pliers and 300 pieces grommets in 10 different colors, 30 pieces of each color and 100 pieces gold grommets Specification: The inner diameter of the eyelet is 5mm and the outer diameter is 9mm. The barrel length is 3.6 mm. WORK WITH MATERIALS - The clamping pliers tools can press grommets on materials such as plastic, acrylic, canvas, suede, fabric, rubber, chipboard, cardstock, thick cardstock, laminated cards, etc. WIDELY USED - The easy-to-use grommet kit can be used for many different projects, such as shoes, clothing, shoelaces, craft projects, tarps, tarps, tents, awnings and crafts, and to add embellishments to your crafts, etc., Weight: 0.93806692481 pounds, Manufacturer: Rtxbvg