Fangrui Product Details 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. 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