Flex-Hone, Valve Guide, Size .750", 240 S/C Grit. Flex-Hone allows you to precision fit valve stems to proper guide tolerances. It is self aligning to the guide bore and self compensating for hone wear. Provides a plateau finish, which creates proper lubrication to prevent sticking and permits a closer stem to guide clearance. Hones are 240 S/C grit. 1 lbs (0.5Kg) shipping weight.