O-ring dampens noise and vibration and holds the nut in place. Stabilizes the propeller by providing a larger contact point. Black prop nut for trolling motor reduces noise and vibration. Replacement of support nuts and washers provides smoother, quieter, and flex-free operation, reducing wear and tear on the trolling motor and battery. Includes built-in cooling ports to lower operating temperatures and extend battery life. Black prop nut is machined from 6061 billet aluminum with anodized protection for durability. Built-in cooling port helps reduce operating temperature and extends battery life. Easy to install with no tools required. Features easy-to-grip knurled edges. O-rings stabilize the propeller by increasing the contact area, reducing propeller noise and vibration. Remove the existing propeller nut and washer. Hand-tighten the eliminator until snug against the propeller face. Note: A spacer on the back of the eliminator expands over time; do not overtighten. Material: High-quality aluminum billet with black anodized finish, corrosion-resistant for extended service life. Application: Compatible with: GFEL-MG-R-DP Trolling Motor. (Note: Not compatible with Hydrilla Hacker Props.) Color: Black Material: Aluminum Package Contents: 1 x Trolling Motor Prop Nut Eliminator Note: Light reflection and display differences may cause slight color variation between the image and the actual item. Measurement may vary by +/- 1-3 cm.