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This metal Sky-Watcher Twist Lock Adaptor is an innovative 2""-1.25"" low-profile helical self-centring eyepiece adaptor designed to securely grip your 1.25"" accessories with its polypropylene compression ring, centring them in your 2"" focuser. Furthermore, unscrewing the knurled locking ring exposes a male T-thread on the lower black barrel, which functions as a 2"" to T-thread adaptor by itself.