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): 510 Radius of Movement(mm): 400 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=407 L1=220 D1=12 L2=187 D2=10 Threads [see 2nd picture]: M1=M8 M2=M8 Info on Base: Holding Power (n): 900 Dimensions (mm): 70 x 50 x 55 Thread: M8 If you value affordability and accuracy the Fisso Classic 3300-40 F + SMC 3/8" Articulated Indicator Holder Arm & Switch Magnet with be a great choice for your measuring task. It can be used for most machining tasks in tandem with a gauge, and is great for measuring work pieces. It includes the adjustment (indicator holder), and base so you don't need other accessories to start using it. Using your Fisso articulating arm is simple. 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.