Description: 50 Pieces M4 Aluminum Rivets Blind Rivets Dome Head Open End Black Lightweight, excellent corrosion & rust resistance in salt water applications; reusable, durable and easy installation 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 Multipurpose, great for rubber dinghy, kayak, canoe, inflatable boat, rowing boat, fishing boat to secure deck lines or run shock cord rigging; also perfect for race cars, snowmobiles, trailers & general repair 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: 50 Pieces Aluminum 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.