This is a Flex Hone used to Hone the E-46, 47, 57, 58, 60H, 61, 66, 68, and 88 Lift Cylinders (Click Related for E-60 Hone). Removes rust and pits. Will not remove bad pits, and scores but will smooth them out. Most can be honed, but some are just too far gone. We always hone Lift Cylinders when installing seal kits here in our shop. This is the same hone we use. Instructions on package. We force a clean damp rag through the cylinder when done in both directions to fully remove all traces of grit. Then clean with solvent.