O-ring dampens noise/vibration and holds the nut in place. Stabilizes the propeller by providing a larger contact point. Trolling motor black prop nut of the traction machine lessens the noise and vibration of the propeller. Replacement of the support nuts and washers provides smoother, quieter, flex-free operation and reduces wear and tear on the trolling motor and battery. Additionally, it acts as a heatsink with built-in cooling ports to lower operating temperatures and extend battery life. Trolling motor black prop nut is machined from 6061 billet aluminum with anodized protection for durability. Trolling black prop nut built-in cooling port reduces the operating temperature and extends the life of the battery and tractor. Easy to install: no tools required. Easy-to-grip knurled edges. O-rings stabilize the propeller by providing a larger point of contact. Reduce propeller noise and vibration. Remove the existing propeller nut and washer. Hand-tighten the eliminator so that it fits snugly against the propeller face. Note: There is a spacer on the back of the eliminator that will expand over time, so be sure not to overtighten it. Material: Made of high-quality aluminum billet with black anodized treatment, rust-proof and longer service life. Application: Compatible with:for MotorGuide GFEL-MG-BK-DP G-Force Trolling motor black prop nut Compatible with Motorguide Trolling Motor GFEL-MG-R-DP.(NOTE:Will not work with for Kipawa and for Hydrilla Hacker Props.) Colour:Black Material:aluminum Package Contents: 1 * Eliminator Trolling Motor Prop Nut 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.