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Your cart is empty.The Starrett 657 Set Including Magnetic Base has three precision ground, magnetic contact surfaces. Grips horizontally, vertically or upside down. V-step holds base to round surfaces. Extra #1/4-20 tapped hole in one side of base (not shown) for mounting post. Available with or without Starrett AGD Dial Indicators: inch reading 25-131J (graduation .0005", dial reading 0-25-0, range .125") or millimeter reading 25-181J (graduation 0.01mm, dial reading 0-50-0, range 2.5mm). Other indicators can be furnished on request. Magnetic Base with 657G/657H/657J/25-131J. The centerpiece of this tool is its three precision ground magnetic contact surfaces. Complemented by a V-step, these surfaces ensure a stable and unwavering attachment, laying the foundation for accurate measurements. The swivel post assembly elevates the tool's versatility. This feature allows for universal adjustments, ensuring flexibility in both horizontal and vertical planes. Completing the set is the AGD dial inch reading indicator. Rooted in Starrett's legacy of precision tools, this indicator ensures every reading is both accurate and easily discernible. The combination of this dial with the magnetic base and upright post assembly creates a holistic measurement solution, ready for any challenge.