Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 3/8 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.14 in, Abrasive Length 2 in, Overall Length 8 in, Abrasive Material Diamond, Grit 170/200, Compatible Tool Type Brake Cylinder, Wheel Cylinder, Operating Speed – Maximum 1,200 RPM, Primary Material Application Stainless Steel, Compatible Bore Diameter – Minimum 9 1/2 mm, End Marking Color Red, Grade Coarse, Stem Marking Color Yellow