Sturdy material ensures maximum strength and durability for long lasting usage. Non- tires on the inner side provide flexibility and stability. The single locking knob fixes angle tightly and holds your camera accessories solidly for fast and safe operation. Simple to use. Just attach monitors or small lights to your camera while video. perfect for GPS, smart phone, LCD, monitor, DV Video, light, camera, etc. and multi-functional, convenient to carry. Double Ball Head only, other accessories demo in the picture are not included! Specification: Type: Accessories Colour:black Material:Aluminum alloy Size:90 x 24 x 20mm Package Contents: 1 * Arm Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.