JMI Wheeley Bars, Triangle Style for 8", 10" and 12" DobsoniansJMI Wheeley Bars, Triangle Style for 8", 10" and 12" Dobsonians Triangle Style Dobsonian Wheeley Bars are open at the center to allow for Dobsonians with encoders on the bottom of the groundboard, but they work equally as well for Dobsonians without encoders. Fits 8", 10", and 12" Dobsonians. Comes standard with 2. 5" locking caster wheels and no leveling screws. As an option, you can add leveling screws and the hardware as needed to install them. As