Pack of TEN plastic rim nuts for TR218 tube stems found on modern tractor tubes as well as farm, implement, and construction tubes with TR218 stems. Do not use brass rim nuts unless you want to buy a new tube every time you fix or change the tire. The brass corrodes and seizes thus you end up destroying the tube if you have to take it apart to fix the tire. With the plastic nuts you simply break it with a chisel if the threads are corroded to get it apart and slavage the tube. The plastic nuts are also forgiving going back if you have corroded threads, you can force the plastic nut on. Brass ones won't go on unless the threads are perfectly clean.