One of the most frustrating obstacles to quick pump repair is getting carbon bushings and wear ring components in a timely manner. In most instances, we can ship your order within twenty-four hours. You won't find that level of service anywhere else. All bushings are machined to the size you specify with a tolerance of +0.001", -0.000 on both the inside and outside dimensions. Lengths are held to a tolerance of +/- 0.005". Unless you request otherwise, all bushings and wear rings have a .005" diameter X .031 long starter relief on one end to ease installation.