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TSSLOTA9 rings are designed to fit most 9” telescopes. The rings are ¾” thick and can be machined to fit a tube diameter from 9.750” to 10.250”. These weigh approximately (depending on inside diameter) 4.0 lbs per set. Examples of typical telescopes that these would fit are: Celestron C9.25 SCT Orion 9.25 SCT