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): 335 Radius of Movement(mm): 288 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=288 L1=161 D1=12 L2=127 D2=10 Threads [see 2nd picture]: M1=M8 M2=M6 (in rare cases this may be M8, if that matters to you let us know. This is the end that connects to the adjustment). Need a base for your Fisso arm? You can find them here. The Fisso Classic 3300-28 F 3/8" Articulated Indicator Holder Arm is an affordable & accurate option for a wide array of machining tasks. It's used in tandem with a gauge, and great for measuring work pieces. It includes the adjustment (indicator holder), but not a base. 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.