THUNDER TIGER K-ROCK MT4 Pom Polyoxymethylene Fromt Cupped Seat Ball Threaded Collars W/Rubber O-ring - 4pc set - GPM KG021/DC
1. The function of this part is to give a more secure and stable ride and increases precision turning with less slop and play, no more sudden "jerky" motions. 2.POM Polyoxymethylene is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability