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): 399 Radius of Movement(mm): 287 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=287 L1=172 L2=115 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-28 P + M 3/8" Articulated Indicator Gauge Holder Arm & Switch Magnet is second to none. It's a must-have when your machining project requires easy, quick, & highly accurate measurements. The Fisso articulating arm includes everything you need to operate it, all you have to do is add your favorite dial gauge or indicator. After the gauge is added just place, & engage the base, move the arm into position and turn the knob. Now you're ready to start taking measurements! Still have questions? You can contact us, or take a look at the Fisso Resource Center.