Features: Easy, fast & accurate positioning of products, mirrors, lights and more. One knob allows for simultaneous tightening / releasing of all 3 joints. Uses a maintenance-free, mechanical central tightening system. Quick, stepless lock. High-quality light alloy. Swiss made. ROHS and REACH compliant. Overall Height(mm): 310 Radius of Movement(mm): 200 Extension(mm): 200 Arm Dimensions (mm) [see 2nd picture]: L=200 L1=120 D1=10 L2=80 D2=9 Threads [see 2nd picture]: M1=M6 (may be M8, and depends on availability. If this matters to you please contact us and ask) M2=M6 Info on Steel Base: Dimensions (mm): Ø 100 mm Thread: 3x M6's Info on Clamping Base: Dimensions (mm): 80 x 20 x 40 mm Thread: 2x M6's If reliability & precision are important to your task then you should get the Fisso Strato S-20 Photography Articulated Arm Kit With Clamp. It's different than many other photography arms because it was created by a company who specialized in developing arms for extremely precise machining and manufacturing tasks. This arm is so popular there's a good chance you've seen an advertisement where it was used by the photographer or videographer and you didn't even know it. The kit includes 2 bases, a clamp and more. Just look at the pictures for a complete list. Operating your Fisso articulating photography arm is simple; just add the item you'd like to hold, move everything into position, twist the knob, and you're ready to start taking pictures. Still have questions? You can contact us, or take a look at the Fisso Resource Center.