First you need to a hole in the and then use eyelet pliers to fix the grommet Metal eyelet tools are used to make clothes, blankets, wallets, bags, belts, shoes The hole diameter of the left interchangeable are 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm The eyelet puncher are designed to hold well with the hand easy to use, and can reduce hand pressure, very useful and multi-functional Grommet eyelet pliers can be used for fabric,, acrylic, Manufacturer: SHANGYAKEJI