Features: Brand new and high quality These excellent electronic optical edge finders quickly locate work edges and save time when finding positions on milling machines, jig borers, etc. Probe hardened and precision ground; not necessary to rotate while measuring. The sensor is spring-loaded to prevent accidental damage by overrun. LED lights instantly and it beeps when probe touches conductive workpiece, louder and brighter. Shank diameter: 20mm, probe diameter: 10mm, accuracy: 0.005mm Suitable for traditional milling machines and integrated processing machines Specifications: Material: Stainless steel Box size: 200 x 60 x 35mm / 7.87 x 2.36 x 1.37 in Finder length: 160mm / 6.3 in Shank diameter: 20mm / 0.8 in Probe diameter: 10mm / 0.4 in Note: Please allow 1-3cm error due to manual measurement. Please ensure you are comfortable with this before purchasing. Due to differences between monitor displays, the picture may not reflect the actual color of the item. Package includes: 1 x Electronic edge finder 1 x Wooden box