Precision machined steel washer ensures exact alignment of flash suppressors and other muzzle accessories that require a washer. Fits AR-style .308 rifles with 5/8" threaded muzzles.
SPECS: Steel, blued. 5⁄8" (.625”/1.59cm) I.D. 13⁄16" (.813”/2.06cm) O.D.
Catalog page 18, 21