Bob's Knobs are made from black oxide steel and are 12mm in diameter or 1/2".
The threads are black, oxide steel.
The factory dust cover will typically fit with Bob's Knobs installed. Some early versions of this de
Collimation screws with metric threads are on all versions of the Celestron C6 SCT.
Bobs Knobs Celestron 6" SCT f/10 Collimation Knobs Secondary C6 Now there is no more tools needed to make collimation adjustments to your telescope! It's easy, just grab a Bob's Knob and turn. You can even collimate while looking through the eyepiece on most telescopes. What's more, you'll never drop that pesky little Allen wrench or screwdriver in the grass again. Installation is a snap with included instructions, and you can undo the modification at any time.
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