Set of 3 pieces Flat Grommet Setting Tool, a driver (setter), anvil designed for flat grommet and your selected-proper-size hole cutter FLAT GROMMETS ARE SOLD SEPARATELY** Setting tool is used for one size grommet only! Ex. 13mm tool is for using with 13mm grommet only. Wide application: grommets suit for DIY crafts such as bucket bag, purse, hats, jeans, wristbands, jacket, shoes, clothing accessories and so on.