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OPT allows you to choose from a wide selection of screw sizes and knob styles for all your telescope thumbscrew and hand bolt needs. Bob’s Knobs enables easy installation, you can even do it while looking through the eyepiece on most scopes. And you'll never drop that pesky little Allen wrench or screwdriver into the grass again. Installation is a snap with the included instructions, and you can undo the modification at any time.