GBD40020AO FLEX-HONE, 4.000 (102mm) bore, 13.5 OAL, 20 Grit, Aluminum Oxide (AO)
Flexible Cylinder Hone, Compatible Bore Diameter - Maximum 4 in, Compatible Firearm Caliber Not Applicable, Stem Diameter 0.31 in, Abrasive Length 6 in, Overall Length 13 1/2 in, Abrasive Material Aluminum Oxide, Grit 20, Operating Speed - Maximum 600 RPM, Primary Material Application Stainless Steel, Compatible Bore Diameter - Minimum 3 1/2 in, End Marking Color Brown, Stem Marking Color Black.