The versatile 5/64 In. (2.0 mm) diameter Diamond Coated Wheel Point is coated in diamond particles for quick and easy material removal in hard materials. diamond coated wheel points work well for fine detailed work in wood, jade, ceramic, glass, hardened steel, semi-precious stones and other hard materials. The ball shape of the accessory can be used to make concave cuts or hollows out material - the tip makes round bottom slots and grooves and can be used for rounded side cuts.