This is a Flex Hone used to Hone the E-60 (Smaller Diameter) Lift Cylinder. Removes rust and pits. Will not remove bad pits, 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 rag through the cylinder when done to fully remove all traces of grit.