JRP Riveting Products M8 x 18.5 (2.0-4.5) A2 St.Stl Countersunk Head Round Knurled Body Open JRP Rivet Nuts (Box of 250)The JRP Riveting Products M8 x 18. 5 (2. 0 4. 5) A2 Stainless Steel Countersunk Head Round Knurled Body Open Rivet Nuts are designed for secure fastening in various applications. These rivet nuts provide a strong and reliable connection, making them ideal for both DIY and professional projects. High Quality A2 Stainless Steel for Durability Knurled Body for Enhanced Grip and Stability Open Design for Easy Installation and Use Compatible with M8