PEARL ADP-20 Adaptor Clamp suits 5/8" - 1-1/8" and 1/2" - 1-1/8" tubes. The ADP-20 is the most common and simply designed Pearl multiclamp perfect for adding extra cymbal arms, tom arms or percussion mounts easily and effectively to add extra items to your set up. Also use the Pearl ADP-20 adaptor clamp to attach music trays, IPAD/Tablets and module brackets to your stands. OXYGEN Music proudly stocks a wide selection of Pearl Drum hardware, accessories, racks and clamps, including the most popular Pearl ADP-20