Excellent quality: Well Nut Material: High Quality Rubber with Brass Nut; Screw Material: Stainless Steel; Authentic materials are real stuff. Superior applicability: Kayak well nuts are made of materials with Good rust resistance, resistance, Great for Motorcycle, Kayaks, Canoes, Boats, Marine, and other Water or outdoor application. Application Functions: M5 Windscreen Nuts assortment set & stainless screw grip range 0.4-4.9mm, and This detachable screw anchor is suitable for plates up to 16.5mm thick, such as glass, metal, plastic plates... Easy to Install: Screw the stainless steel screw tapping nail from the flange of well nut and tighten it, Rubber well nuts are the good choice for seal holes to prevent leaking,The design of the rubber Nut is to allow multiple disassembly and re-installation, without affecting the performance. Well Nut Installation Precautions: Well nuts installation needs to that the drilling size is accurate, avoid too tight or too loose, avoid excessive tightening during the installation process, which damage the rubber material, and also need to check the state of the Well Nut regularly after installation to its tightness and tightness. Color:Black & Silver Material:Rubber + Brass + Stainless Steel Package Contents: 30 * Neoprene Well Nut 30 * Screw Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.