Features: brand new and high quality Suitable for traditional milling machines and comprehensive processing machinery. The speed is 400-500 rpm. Mechanical rotation measurement, no clamping error, repeat measurement accuracy up to 0.005 mm. The 4 mm probe is designed to measure small apertures and narrow grooves. The lower rotating part adopts anti-magnetic design. The function of the centering rod: Determine the position of the workpiece/determine the working coordinate system. High Quality Material: Made of high quality high speed steel, stable, firm and durable. Specifications: Material: High Speed Steel Color: As the Picture Shows Product Dimension: approx. 87x10x17x10x4mm/3.43x0.39x0.67x0.39x0.16inches Net Weight: 50g/0.11lbs Package Includes: 1x Non-magnetic Mechanical Edge Finder note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.