The blades in this range have continuous, diamond-tipped rims. They are used to cut materials, which cannot be cut with an alumina or silicon carbide cutting wheel, such as carbides, ceramics, PCBs, composites and glass. They are not designed for cutting ferrous metals and alloys. Metal Bonded Diamond Wheels for use on non ferrous metals, medium hard ceramics, spray coatings, MM composites & PC boards. Hole size: 12.7mm to 32mm.