SizeThe eyelet size has an outer diameter of 8mm, an inner diameter of 4mm, and a height of 7mm, for your DIY projects. MaterialGrommets are made of iron, sturdy and durable, which is rustproof and does not deform when used. WorkmanshipOur eyelets look beautiful and delicate, perfect for decorating card making, scrapbooks, leather crafts, and so on. ApplicationGrommet kits are suitable for DIY craft projects such as bags, clothing, shoes, tarps, tents, canvas, hats, crafts, and other DIY projects. NoteIf you are using pliers, please pay attention to the direction of the buttonhole and the pliers. also please keep them away from children to avoid choking by mistakes. Size Chart: outer diameter: 0.8cm/0.31inch inner diameter: 0.4cm/0.16inch height: 0.7cm/0.28inch Package Includes: 100Metal Eyelets Set Note: Please allow slightly errors due to manual measurement and different monitors.