Fits Zerotech Trace Model & Large Model rifle scopes. ZT THRIVE HD 2.5-15X50 PHR II - TH2155P, ZT THRIVE HD 2.5-15X50 PHR II - TH2155P-IR ZT THRIVE HD 6-24X50 PHR II - TH6245P ZT THRIVE HD 6-24X50 PHR II - TH6245P-IR ZT TRACE 3-18X50 R3 MOA - TR3185R3 ZT TRACE ADV 4.5-27X50 RMG FFP - TR4275F ZT TRACE 4.5-27X50 R3 MOA- TR4275R3 ZT VENGEANCE 4-20X50 PHR-II - VG4205P ZT VENGEANCE 4-20X50 PHR-II IR - VG4205P-IR ZT VENGEANCE 4-20X50 R3 - VG4205R3 ZT VENGEANCE 4-20X50 R3 ILLUM - VG4205R3-IR ZT THRIVE HD 3-18X56 PHR II IR - TH3186P-IR