This is a Flex Hone to help clean the rust and pits out of the Pivot Pin Tubes when replacing Pivot Pins. Use a CORDED drill, A Cordless doesn't have the torque you need. Dip the Hone in oil before use. Go at a slow RPM when honing. Keep the hone moving in and out of the sleeve when honing. Test fit the new pin, if it goes in smoothly, you are done. Be sure to clean the tube with brake cleaner to get the rust and grit out. Be sure to grease the new pin and the inside of the sleeve before installing it.