Shark R120Z Flex-Hone For Rotors, Grit-120 Go to amazon.com Related posts Check expert advices for flex hone for rotors? FeatureRotor hone: MediumOriginal equipment manufacturer #: RMFH120Z25Made in the US DescriptionPatented swirl finish tool. Flex-hone rotor finishing tool uses patented technology for brake rotor finishing! Produces an ideal surface finish on disc brake rotors and flywheels.