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1 3/4" Engine Cylinder Hone for all engine applications utilizing bores from 1.62" to 1.78" or 42mm to 45mm. 80 grit Brand new sealed in package engine cylinder flex-hone. Designed to work with cylinder bores from 1.62" to 1.78" or 42mm to 45mm. Perfect for all engine types and block materials. Made in USA by the one of the best cylinder hone manufacturers, FLEX-HONE. 80 grit, GOOD for cylinder clean-up, scratch removal. Tool is labeled as 1.750" diameter but is actually slightly larger to provide the required wall force for a 1 3/4" bore Tool is self centering and easy to use Tool can be used with a 3/8" or 1/2" chuck portable drill or drill press This patented Flex-Hone is the best way to create a Cross Hatch surface finish with suspended globule working abrasives. Contact us for more information as we use this hone on all of our race motors. Most of the engine hone articles reference this exact brand and type of tool. THIS TOOL HAS THE 8" LONG SHAFT for engine rebuilding. work with bores from 1.62" to 1.78" or 42mm to 45mm