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Designed to work with Nikasil cylinder bores from 3.35" to 3.800". Perfect for all Nikasil coated/plated engine cylinder blocks materials. 320 grit, EXCELLENT for re-ringing jobs or final bore. Tool is labeled as 3.750" diameter but is actually slightly larger to apply the required cylinder wall for for 3 3/4" Flex-hone can be used with a portable 3/8" or 1/2" hand drill or drill press