Material: Made of durable metal, they are sturdy and resistant to corrosion and rust. Grommet installation tool to reinforce holes and prevent tearing. Convenient: These durable eyelets are easy to use, perfect for canvases, tarps, tents, awnings, belts, clothing, purses, bags and other items. Easy storage: All eyelets and tools are contained in a transparent storage box. Allows you to easily search for matching components. Eyelets dimensions: Inner hole diameter: 12mm, outer diameter: 21mm, height: 6mm. Features: First punch a hole on leather, leather straps or clothing with the punch tool, then use the hammer to put the eyelets in place. This is a set of handy tools for adding ornaments to your crafts. Features: Product Name: Grommet Kit. Color: silver white. Size: 1. Product dimensions: Inner hole diameter: 12mm. Outside diameter: 21mm. Height: 6 mm. 2. Box dimensions: 14.6 x 8.5 x 3.5 cm. Contents: Set of 100 eyelets and 3 fastening tools. - Note: Please keep them away from children to avoid choking.