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): 568 Radius of Movement(mm): 450 Microfine Adjustment hole diameter: 3/8" 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 Info on Base: Holding Power (n): 1000 Dimensions (mm): 75 x 50 x 55 Thread: M8 If you need a large indicator holder arm with a far reach you're going to want the Fisso Classic 4400-45 F + SM 3/8" Articulated Indicator Holder Arm & Switch Magnet. It can measure work-pieces on larger industrial machines because of the longer-than-normal reach. This item includes the adjustment (indicator holder), and base so you don't need other accessories to start using it. 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.