Use this Superclamp in conjunction with two Ultimate Support TBR-180 18" tribars or two TBR-130 13" Tribars to comfortably support a larger keyboard on a standard Apex stand. Ultimate Support CMP-485 Super Clamp Assembly for APEX AX-48 Pro Keyboard Stand Tier System The CMP-485 Super Clamp is built for use with two Ultimate Support Tri-bar arms (sold separately). When used with two Tri-bar arms, the CMP-485 Super Clamp forms one APEX tier to be used on an APEX AX-48 Pro keyboard stand. Total load capacity is not to exceed 250 lbs. and only two tiers are encouraged. CMP-485 Super Clamp Features: • Extraordinarily strong tier support • For use with Ultimate Support TBR-130 (13") or TBR-180 (18") Tri-bar arms (sold separately) • To be used on an Ultimate Support APEX AX-48 Pro keyboard stand • Height-adjustable fitting • Hardware included