Specification Brand : Brush Research BulletPoint1 : Flexible Cylinder Hone made of Silicon Carbide BulletPoint2 : Hone is Made in USA by Brush Research Manufacturing BulletPoint3 : Hone is self centering and can be used with 3/8" or 1/2" chuck drill BulletPoint4 : Perfect for bore honing and cylinder refinishing BulletPoint5 : The hone size listed on the product is the bore it is intended to be used for (or slightly smaller bore will work) ItemName : Brush Research 1 1/4" (31.8mm) Flex-Hone Cylinder Hone Tool 320 Grit (Silicon Carbide) ItemPackageQuantity : 1 ItemTypeKeyword : flex-hones Manufacturer : Brush Research Material : silicon carbide PartNumber : BC114320SC ProductDescription : The Flex-Hone tool is a surface refinishing tool that will is used to refinish and restore cylinder bores. The surface finish is dependant on the grit used. The tool is used for applications like engine rebuilding, hydraulic cylinders, brake rebuilding and general machining operations. Flex-Hone Tool can be used with honing oil or engine oil. If honing hydraulic cylinders use the intended hydraulic fluid for the lubricant.