Dritz Double Cap Rivets are small 2-piece fasteners that are used to secure multiple layers of fabric, or to attach belting or straps onto bags or other items. The double-cap feature of these rivets provides a finished appearance on both sides of your project. Rivets provide a no-sew solution for DIY projects with hard to reach areas and thick layers. Rivets are suitable for fabric, vinyl, leather, canvas, belting and other materials. Gunmetal 24pc- Rivet caps are 8 mm and rivet post is 6 mm tall.