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Designed to work with Nikasil cylinder bores from 3.25" to 3.800". Perfect for all Nikasil coated/plated engine cylinder blocks materials. 240 grit, EXCELLENT for re-ringing jobs or final bore. Tool is labeled as 3.750" diameter but is actually slightly larger to provide the required cylinder wall force Flex-Hone can be used with a 3/8" or 1/2" portable hand drill or drill press.