Engine Cylinder Flex Hone 3-1/2" #2486 Use on bore sizes 3-1/2" to 3" (89-76mm) Grit is 120 Abrasive balls each have independent suspension that assures the flex-hone to be self-centering, self-aligning to the bore, and self-compensating for wear. Use with a 3/8" variable speed drill.

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