Features: The Strato U-Line is desirable when extreme precision is required (measurements in the µ range) Easy, fast & extremely precise positioning. Precise microfine adjustment with dovetail and mounting hole. 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. Overall Height(mm): 444 Radius of Movement(mm): 330 Microfine Adjustment hole diameter: 3/8" Dial Gauge is NOT included. 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 Info on Base: Holding Power (n): 1000 Dimensions (mm): 75 x 50 x 55 Thread: M8 The Fisso Strato U-Line A-33 P + SM 3/8" Articulated Indicator Gauge Holder Arm & Switch Magnet definitely won't disappoint. It's a smart choice when your machining task demands easy, quick, & extremely accurate measurements. The Fisso articulating arm includes everything you need to use it, all you have to do is add your desired gauge or indicator. After the gauge is added simply position, & engage the base, move the arm into place, and twist the knob. Now you're now ready to start taking measurements. Still have questions? You can contact us, or take a look at the Fisso Resource Center.