This Sky-Watcher dovetail mounting bar is 33.02cm (13″) long and provides a quick-release platform for attaching telescope tubes to NEQ3, EQ5, HEQ5, and EQ6 mounts. There is a set of adjusting screws on each end for people who wish to perform cone error calibration to the telescope/mount set up. Also available in 20.32cm (8″) length.