Features: 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.Ultimate Support CMP-485 Super Clamp Features:Extraordinarily strong tier supportFor 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 standHeight-adjustable fittingHardware includedPRODUCT SPECIFICATIONS:AX-48 Pro Tote Specs:USS Part Number: 17367Length: 53 (1346mm)Width: 8 (203mm)Height: 8.5 (216mm)Boom Arm Pocket (Length): 22 (559mm)Weight: 1.5 lbs. (.7 kg) Model: CMP485 Manufacturer: Ultimate Support