Universal holder with clamping brackets for all X-Keyboard stands with 30 mm support arms. Recommended for models 18930/18940, 18990 and 18995. The height of the vertical tube can be adjusted individually choosing from 8 positions. With the 3/8" i.e. 5/8" threaded connector other accessories such as the boom arm, gooseneck, iPad holder, Tablet PC holder etc. are easily attached.