The 18817 Universal Holder is a useful accessory for the table-style keyboard stands Omega 18800, 18810 and 18820, as well as 18950 and 18953. With the correct adapter the universal holder can be mounted to the table-style keyboard stands: 18814 for Omega; 18954 for the 18950 and 18953 (this is only required, if an accessory is already mounted to the existing support tubes). The height of the vertical tube can be adjusted individually choosing from 8 positions. The 3/8" i.e. 5/8" threaded connector connects other accessories, such as boom arm, gooseneck, iPad holder, Tablet PC holder etc.