Dreyoo Edge Finder, Milling Machine Edge Finder For Flat, Straight Edge, Center Milling Machine Edge Finder, Convenient and Practical to Use Feature and Function: Specification: Warm tip: Accurate Edge Finding: the edge gauge is the ideal tool for most craftman who needs precise job placement; Rated up to 1, 000 RPM, it locates round or flat workpieces to within 0.0005 inches Professional Design: with its lightweight design and easy usage, it is a reliable tool applied by machinists to locate center points and scribe lines; The whole is made of tool steel, finely hardened, ground and lapped with extremely tight tolerances on diameter and concentricity; Designed to be quick and easy to use to get the job done every time Versatile Application: can be applied to locate edges on any surface, including flat surfaces, straight edges, shoulders and grooves, as well as rounded workpieces such as dowels or the center of a circle; Finds the precise edge location and helps you determine the exact position Easy to Use: use it in a standard 1/2'' diameter collet or chuck; As it rotates and approaches the edge of the workpiece, it stops wobbling violently and the head moves about 1/32'' to the side, making it easy to record accurate data Warm Tips: make sure all working surfaces are hardened and ground, please contact us if you have any problem