Due to the special shapes of series A mounted points, it is possible to grind in a variety of contours. A38 Vitrified Mounted Point 1/4" Shank - Ceramic oxide 46 Grit TOUGH The TOUGH type is specifically designed for use on titanium materials, nickel-based and cobalt based alloys, hardened steel components and built-up weld deposits..The applications range from grinding out slits and grooves in hard-to-reach areas to machining bores and small holes as well as smoothing.