Bob's Knobs
Bob's Knobs allow tool free collimation of the secondary mirrors of Schmidt-Cassegrain and many Dobsonian telescopes. Bob's Knobs for Celestron
13Bob's knobs allow you to collimate your Celestron SCT or EdgeHD optics without tools.
Bob's Knobs for Sky-Watcher
3Bob's Knobs are a significant upgrade to the factory collimation knobs and screws on Sky-Watcher Dobsonians.
Bob's Knobs for Orion
2With Bob's Knobs you never run the risk of dropping a screwdriver onto the primary mirror of your Orion SkyQuest Dobsonian.
