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This brand new sealed in package Commercial Version engine cylinder hone is for 3.825" to 4.055" BORES. 320 grit, Excellent for re-ringing jobs or final bore utilizing performance or Moly rings. Tool is labeled as 4.000" diameter but is actually slightly larger to apply the required wall for force honing a 4.000" bore Tool is self centering and easy to use, Hone can be used with a 3/8" or 1/2" chuck portable drill or drill press or other Made in USA by the one of the best cylinder hone manufacturers.