Their easy-to-use smooth, sealed finish won't collect dirt, snag rags, or cut fingers or tires. Easy to drill out, these rivets are perfect for oval track cars, sign construction, auto body repair, and many other uses. These blind rivets are made from high-quality materials and are available in a choice of colors. Rivet Size:3/16 in. Rivet Head Diameter: .375 in. Rivet Grip Range:0.251-0.375 in. Rivet Body Material:Aluminum Rivet Length: .650 in. Rivet Nail Material: Steel Mandrel Diameter: .114 in. Hole Size: .192 - .196 in.