- 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 M5 (screws included), simple to install. - Great for Kayaks, Canoes, Boats, and other marine applications