Description: 24Pcs M4 Aluminum Pop Rivets Blind Rivets Dome Head Open End Black Excellent corrosion and rust resistance in salt water applications Smooth, sealed finish won't collect dirt, snag rags, or cut fingers or tires Used to connect two pieces of material in a quick efficient way Reusable, durable and easy to use Size Chart: M4 x 8 Overall Length: Approx. 40 mm / 1.57 inch Head Length: Approx. 8 mm / 0.31 inch Rivet Diameter: Approx. 4 mm / 0.16 inch M4 x 10 Overall Length: Approx. 42 mm / 1.65 inch Head Length: Approx. 10 mm / 0.39 inch Rivet Diameter: Approx. 4 mm / 0.16 inch M4 x 12 Overall Length: Approx. 44 mm / 1.73 inch Head Length: Approx. 12 mm / 0.47 inch Rivet Diameter: Approx. 4 mm / 0.16 inch M4 x 14 Overall Length: Approx. 45 mm / 1.77 inch Head Length: Approx. 14 mm / 0.55 inch Rivet Diameter: Approx. 4 mm / 0.16 inch M4 x 16 Overall Length: Approx. 47 mm / 1.85 inch Head Length: Approx. 16 mm / 0.63 inch Rivet Diameter: Approx. 4 mm / 0.16 inch M4 x 20 Overall Length: Approx. 50 mm / 1.97 inch Head Length: Approx. 20 mm / 0.79 inch Rivet Diameter: Approx. 4 mm / 0.16 inch Package Includes: 24 Pieces Aluminum Pop Rivets Note: Due to the differences between different monitors, the picture may not reflect the actual color. There is 2-3% difference according to manual measurement, please check the size carefully before you buy the item.