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