Adjustable alt-azimuth base for SkyTracker Pro and SkyGyider Pro mounts. Allows for repositioning during polar alignment while a mount is attached to a tripod. The base has a built-in bubble level. It accepts Vixen-type dovetail bar. The altitude adjustment range is from -30 Degree - 65 Degree , so you can mount your device/scope on the either side for better balance.This adjustable alt-azi base/wedge also fit with other small camera mounts.