Phil Wood Classic Track Lockrings are hand-made with materials sourced from the United States. This lockring is an Italian threaded lockring. Italian threaded lockrings are used on Campaganolo, Phil Wood, Miche, and other hubs that utilize a 1.32" x 24 tpi threading.
**It should be noted that ALL track hubs use the same cog threading but there are various lockring thread pitches.**
Check 'here' for a French threaded lockring.
Check HERE for a common, JIS threaded lockring.