Features: Easy, fast & accurate 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) 255 Radius of Movement(mm) 200 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=200 L1=120 D1=10 L2=80 D2=9 Threads [see 2nd picture]: M1=M8 (not fully shown in main picture) M2=M6 The Fisso Strato S-20 F 8mm Articulated Indicator Gauge Holder Arm is a top choice for easy & accurate measurements in a jiffy. Add your favorite gauge, and attach the arm to a machine or base. Then all you need to do is put it into position, turn the knob, & you're ready to start measuring! Still have questions? You can contact us, or take a look at the Fisso Resource Center.