Description: - Rubber nuts consist of a flanged neoprene rubber bushing with a captive brass nut. - Tightening a threaded screw into the brass nut expands the insert to secure the fixing. - Resistant to vibration and shock - dampens noise. Fastens in blind, burr-free holes. - Used with standard metric machine screws (screws included), simple to install. - Great for Kayaks, Canoes, Boats, and other marine applications. Specification: - Nut Material: High Quality Rubber with Brass Nut - Screw Material: 304 Stainless Steel - Color: Black, Silver - Size: M4*20, M5*25, M6*30 - Quantity: 12 pieces Package Includes: 12 Pieces Well Nuts Kit with Screws