These top of the line boom stands feature a variable, piston-type air suspension system to ensure microphone protection. Model SB-36W is equipped with silent-motion, ball-bearing swivel casters of hard rubber for friction-free and vibration-absorbing mobility. Two-piece horizontal boom assembly is 7/ 8" dia. cold rolled steel with a heavy-duty, die-cast, gyromatic swivel and an adjustable 6-lb. counterweight for precise and secure orientation. Tubing terminates with an adjustable mic holder swivel with standard 5/ 8" - 27 thread to accept all microphones, holders, and adapters.Vertical tube assembly is manufactured of 1-1/ 8" and 7/ 8" chrome-plated cold rolled steel and includes the wear proof Atlas Sound grip-action clutch for easy adjustment and positive locking. Model SB-36W includes wheels for a height span of 49" to 73". Triangular cast metal base with edge-concentrated weight distribution offers extra stability and is finished in ebony epoxy with a chrome shell.