Ultimate Support TBR-180 Tribar Arms- 2 18" Support Arms for Use with CMP-485 Super Clamp Assembly On the AX-48 Pro Extraordinarily strong tier support arms For use with Ultimate Support CMP-485 Super Clamp (sold separately) To be used on an Ultimate Support APEX AX-48 Pro keyboard stand 18" Tribar arms for supporting deeper, larger keyboards, synths, and workstations