2 Rockville DJ PA Tripod Speaker Stands Hydraulic Air Powered Auto Lift RVSS4A Rockville RVSS4A Tripod Speaker Stand With Air Lift and Lowering System. Hydraulic System Makes Raising and Lowering The Speaker Quick, Painless, and Safe. Air Assisted Lift allows the speaker stand to raise with the push of a button. Air Assist lowering system lowers the speaker for easy dismounting with the push of a button. Easy Hand-Clutch Mechanism For Air Powered Lift. Easy Hand-Clutch Mechanism for Slow Air Powered Decline/Lower. Built in Pole Track Mechanism To Keep Speaker Pole From Rotating. Adjustable Height 42" - 79" inches. Heavy Duty Steel and Aluminum Composite Construction. Lightweight construction allows for easy maneuverability and travel. Color: Black. Weight Capacity: 154 lbs. Base spread: 0 - 23inches. Tube Diameter: 1.38 inches. Leg Diameter: 1.38 inches Rockville RVSS4A Tripod Speaker Stand With Air Lift and Lowering System Hydraulic System Makes Raising and Lowering The Speaker Quick, Painless, and Safe Air Assisted Lift allows the speaker stand to raise with the push of a button Air Assist lowering system lowers the speaker for easy dismounting Easy Hand-Clutch Mechanism For Air Powered Lift Easy Hand-Clutch Mechanism for Slow Air Powered Decline/Lower Built in Pole Track Mechanism To Keep Speaker Pole From Rotating Easy Twist Locking Pin Mechanism To Keep Speaker at Desired Height Adjustable Height 42&#034; - 79&#034; inches Heavy Duty Steel and Aluminum Composite Construction Lightweight construction allows for easy maneuverability and travel Color: Black Weight Capacity: 154 lbs Base spread: 0 - 23inches Tube Diameter: 1.38 inches Leg Diameter: 1.38 inches