This kit contains everything needed to replace the eccentric assembly for the EBG-20/C. When replacing, Square Scrub recommends installing new isolators as well. Included are: 4 isolators, isolator bolts, motor shaft spacer, motor shaft cap bolt, bearing bolts, eccentric assembly, crush washer, eccentric assembly key, grip face. Not shown: anti-seize, & 100% silicone. Replacement part for 20” machines with serial numbers beginning with 32U.