Sky Watcher Wave Tripod Extension Tube Black. Specifications for Sky Watcher Wave Tripod Extension Tube: Manufacturer: Sky Watcher Color: Black Quantity: 1 Size: One Size Features of Sky Watcher Wave Tripod Extension Tube Extension tube for Wave carbon fiber tripod 7-inch (180mm) length 3.9-inch (100mm) radius Weighs 2.4 pounds (1.1kg) Package Contents: Sky Watcher Wave Tripod Extension Tube Sky Watcher S30912: Wave Tripod Extension Tube Black