Generic Balance Staff Fits Rolex 10 1/2 H, 700, 710, 720, 730, 740, 745, 760, 765, 775Generic Balance Staff Select Collet Hairspring size .40 or .50 ( These staffs come in 3 different hairspring collet sizes .40, .50 .55 make sure this is the correct one for your movement . We only carry 2 sizes .40 and .50)Non Original PartWatchpartusa is independent of and not affiliated with or sponsored by Rolex® Watch U.S.A. Inc
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