Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 5/8 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.19 in, Abrasive Length 2 1/2 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 5/8 in, End Marking Color Blue, Stem Marking Color Black