Flexible Cylinder Hone, Compatible Bore Diameter – Maximum 12 mm, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.17 in, Abrasive Length 2 1/2 in, Overall Length 8 in, Abrasive Material Silicon Carbide, Grit 320, Compatible Tool Type Brake Cylinder, Wheel Cylinder, Operating Speed – Maximum 1,200 RPM, Primary Material Application Stainless Steel, Compatible Bore Diameter – Minimum 12 mm, End Marking Color White, Grade Extra Fine, Stem Marking Color Not Applicable