A2 Vitrified Mounted Point 1/4" Shank - Aluminum Oxide 30 Grit STEEL EDGE The STEEL EDGE type is particularly well suited to edge grinding and deburring work on steel and cast steel components.The applications range from grinding out slits and grooves in hard-to-reach areas to machining bores and small holes as well as smoothing. Its applications also include grinding of chamfers in preparation for welding, and grinding of contours.