EDGE cut tungsten carbide burs have been specifically developed for precise work on edges. The special design allows the bur to run directly along edges without damaging the workpiece. Exact edges can be created in a single step - with either defined chamfers of 30° or 45°, or to a defined radius of 1/8". Rounding edges is a precautionary measure against corrosion according to: ISO 129443, ISO 85013, SOLAS XII/6.3 (Ref. T4/3.01 MSC.1/Circ.1198). Concave radius bur for producing precise rounded edges. Cannot be re-sharpened. Designed for producing and finishing edges with an 1/8" outer radius." The EDGE Cutting System includes EDGE cut burs and a special guide sleeve that can be mounted into a conventional power tool collet to ensure optimal guidance during light deburring work.