Features: The Strato U-Line is optimal when extreme precision is required (measurements in the µ range) Easy, fast & extremely precise positioning. One knob allows for simultaneous tightening / releasing of all 3 joints. Uses a maintenance-free, mechanical central tightening system. Quick, stepless lock. Pre-tensioning: With this model you can lock the bottom portion of the arm in place even if the dial is turned. It's great for taking multiple measurements on the same machine, and for protecting the gauge when the dial is twisted to release the arm. 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=330 L1=201 L2=129 Threads [see 2nd picture]: M1=M8 M2=M8 Fisso Strato U-Line A-33 Articulated Indicator Gauge Holder Arm is a great choice when extremely high precision measurements are required fast & easy. After you attach it to a machine / base and add the adjustment / gauge holder, operation is simple. Just position it, twist the knob and you're ready to start measuring. Still have questions? You can contact us, or take a look at the Fisso Resource Center.