These Excellent Electronic Optical Edge Finder Quickly Locate Work Edges and Save for Time When Finding Positions on Milling Machines, jig Borers Shank Diameter: 20MM, Pro-be Diameter: 10MM, Accuracy: 0.005MM LED Lights Instantly and It Beeps When Pro-be Touches Conductive Work Piece, Louder and Brighter Pro-be Hardened & Ground, Not Necessary to Rotate While Measuring; The Sensor is Spring Load-ed to Accidental Damage by Overun Suitable for traditional milling machines and integrated processing machines, Manufacturer: Whoasyst