The Auto Grip System safely locks the instrument in place. It can accommodate ukuleles of all sizes from soprano to baritone.
The fully adjustable clamp can be attached to any tube or desk withithe following dimensions: 
15.8 mm - 30 mm (0.62-1.18 inch) round tube 
18 mm - 25.4 mm (0.7-1 inch) square tube 
10 mm - 25 mm (0.39-0.98 inch) thickness
Weight: 0.4 kg (0.9 lbs.)
Load Capacity: 4 kg (8.8 lbs.)
Folded Size: 90 mm x 75 mm x 230 mm (3.5 x 3 x 9 inch)