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, red anodized, light 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=130 L1=70 D1=9 L2=60 D2=8 Threads [see 2nd picture]: M1=M6 M2=M6 The Fisso Strato XS-13 Articulated Indicator Gauge Holder Arm is a great choice for fast, easy & accurate measurements. After you attach it to a machine or base and add the adjustment / gauge holder operation is simple. All you need to do is position it, turn the knob, & you're ready to go. Still have questions? You can contact us, or take a look at the Fisso Resource Center.