2 Rockville DJ PA Tripod Speaker Stands+Bags, Hydraulic Air Auto Lift RVSS4AB Tripod Speaker Stand With Air Lift and Lowering System. Travel Bag Included! 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 Pull Pin Mechanism For Air Powered Lift. Push Pin For Slow Air Powered Decline/Lower. Easy Twist Locking Pin Mechanism To Keep Speaker at Desired Height Adjustable height 42" - 79"". 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 The Rockville RVSS4AB is an air charged Pro Audio Speaker stand with automatic lifting and and lowering system. The center pole features an air cartridge which helps to accommodate both the lifting and lowering of any speaker with a weight capacity of 154 pounds! The system height can be adjusted from 47" to 79". (2) Rockville RVSS4AB Tripod Speaker Stands + Bags Rockville RVSS4AB Tripod Speaker Stand With Air Lift and Lowering System Travel Bag Included! 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 Pull Pin Mechanism For Air Powered Lift Push Pin For Slow Air Powered Decline/Lower Easy Twist Locking Pin Mechanism To Keep Speaker at Desired Height Adjustable height 42&#034; - 79&#034;&#034; 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