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. High-quality, red anodized, light alloy. Swiss made. ROHS and REACH compliant. Overall Height(mm) 342 Radius of Movement(mm) 287 Microfine Adjustment hole diameter: 8mm Dial Gauge and base are 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 (not fully shown in main picture) M2=M8 The Fisso Strato U-Line A-28 P 8mm Articulated Indicator Gauge Holder Arm is a prime choice when extremely accurate measurements are required quickly and easily. Add your indicator to the microfine adjustment, & attach the arm to your machine or base. Then just put it into position, twist the knob, & you're ready to start measuring! Still have questions? You can contact us, or take a look at the Fisso Resource Center.