Features Scope of Application: The edge finder is suitable for traditional milling machine and comprehensive processing machine Rotating Speed: The mechanical edge finder use with 400-600rpm rotating speed. Professional Made: The mechanical rotary measurement has no clamping error, and the repeated measurement accuracy can reach within 0.005mm. Specially Design: The edge finder is specially designed 4mm probe for measuring small aperture and narrow groove. Anti-Magnetic Design: Anti-magnetic design of the edge finder is adopted for the rotary part of the lower end. Specification: Name: mechanical edge finder Material: carbon steel Size Large end: 20mm / 0.8in Small end:10mm / 0.4in Total length: 90mm / 3.5in Package list: 1 x Mechanical Edge Finder 1 x box Package List 1 x Mechanical Edge Finder 1 x box