Accurate Edge Finding: the edge gauge is the Perfect 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 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 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 1/2inch diameter collet or chuck; As it rotates and approaches the edge of the workpiece, it stops wobbling violently and the head moves about 1/32inch to the side, making it easy to record accurate data Warm Tips: make sure all working surfaces are hardened and ground, Milling Machine Edge Finder, Convenient and Practical to Use Feature and Function: Precise metrology, Perfect for measuring lengths and marking lines. Light weight, professional design. Reliable for using, can service for a long time. Rated up to 1, 000 RPM, it locates round or flat workpieces to within 0.0005 inches. Can be applied to locate edges on most surfaces, including flat surfaces, straight edges, shoulders and grooves, as well as rounded workpieces such as dowels or center points of circles. Can also be applied to scribe lines on surfaces such as studs or wall panels. Length: 2.7 inch/ 7 cm Colour:Silver Material:Metal Size:3/8inch diameter, 0.200inch diameter Package Contents: 1 x edge finder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.