Adapter for Sonor mobile stand. Use this adapter with your Sonor universal stand base (available separately), to hold a bass chromatic instrument. Includes long & short bars to attach to your stand base, clamps to screw into your Sonor or (new style) Primary Line instruments (the clamps hold the instrument to the stand), and hex key. Instructions are not included - the directions for assembly come with the stand base. Instruments and stand base are each available separately. New style Primary Line instruments work for this stand, since they come with the necessary screw-plates already on the resonator boxes. Primary Line instruments made before 2002 will not work for this stand.