Important: Lead time on this item is currently about 3 weeks. Please contact us for the most accurate info. Features: Easy, fast & accurate positioning. One knob allows for simultaneous tightening / releasing of all 3 joints. Uses a maintenance-free, mechanical central tightening system. Quick, stepless lock. High-quality chrome plated alloy. Swiss made. ROHS and REACH compliant. Indicator holder and base is not included. This listing is for 1 arm. Still need an Indicator? Check out our selection here. Dimensions (mm) [see 2nd picture]: L=635 L1=373 D1=24 L2=262 D2=16 Threads [see 2nd picture]: M1=M10x1.25 M2=M8 The Fisso Classic 6400-63 Chrome Articulated Indicator Holder Arm is affordable, accurate, and simple to use. First you'll need to attach it to a machine or base. Next you can add the adjustment (indicator holder) and indicator. Lastly you'll position it, turn the knob & you're good to go! Still have questions? You can contact us, or take a look at the Fisso Resource Center.