High-performance lubrication system 100,000 mile or 6 year limited warranty. No Touch lubrication system. Filled with Lucas Marine heavy duty grease. No maintenance/service necessary. No re-greasing or inspection needed. Reusable dust cap is threaded for easy removal. Note: 81017/81012 fits all wheels with a center hole of 2.75" or larger, may not fit all 8"-13" wheels.