Important: Lead time on this item is currently about 3 weeks. Please contact us for the most accurate info. 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 chrome plated alloy. Swiss made. ROHS and REACH compliant. Overall Height(mm): 513 Radius of Movement(mm): 450 Microfine Adjustment hole diameter: 8mm Dial Gauge is NOT included. Still need an Indicator? Check out our selection here. Arm Dimensions (mm) [see 2nd picture]: L=453 L1=260 D1=16 L2=193 D2=12 Threads [see 2nd picture]: M1=M8 M2=M8 Need a base for your Fisso arm? You can find them here. If you need a large indicator holder arm with a far reach you're going to want the Fisso Classic 4400-45 F 8mm Articulated Indicator Holder Arm. It can measure work-pieces on larger industrial machines because of the longer-than-normal reach. This item includes the adjustment (indicator holder), but not the base. So you'll need to screw it into your machine, buy a base separately, or use a base you already have. Using your Fisso articulating arm is extremely easy. Attach your favorite dial indicator to the adjustment, 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.