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.