Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 1/4 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.11 in, Abrasive Length 1 1/2 in, Overall Length 8 in, Abrasive Material Aluminum Oxide, Grit 60, Compatible Tool Type Brake Cylinder, Wheel Cylinder, Operating Speed – Maximum 1,200 RPM, Primary Material Application Stainless Steel, Compatible Bore Diameter – Minimum 6 3/8 mm, End Marking Color Grey, Stem Marking Color Black