Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 15/16 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.23 in, Abrasive Length 3 in, Overall Length 8 in, Abrasive Material Aluminum Oxide, Grit 240, Compatible Tool Type Brake Cylinder, Wheel Cylinder, Operating Speed – Maximum 1,000 RPM, Primary Material Application Stainless Steel, Compatible Bore Diameter – Minimum 15/16 in, End Marking Color Blue, Stem Marking Color Black