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Bobs Knobs Celestron 9.25 SCT f/10 Collimation Knobs Standard Secondary C925STD Bob's Knobs Celestron 9.25" SCT f/10 Collimation Knobs fit Celestron 9.25" (23.5cm) f/10 SCT with standard collimation screw threads. (Not for CPC 925 or EdgeHD) *Bob's Knobs are made from black plastic and are 16mm in diameter or 5/8".
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