This is an excellent multi-purpose grinding and sanding abrasive. 3M Ceramic Cubitron and Cubitron II material is self-sharpening. Its long life & uniform cutting action are the best in the industry.JEWELRY applications:Great for grinding sprues from raw castings, shaping the shank of a ring. Quickly takes down excess solder on silver, gold, platinum, etc.WOODWORKING applications:Awesome sharpening abrasive. Regrinds tool edges that have been damaged or rounded over: chisels, woodturning tools, counter-sinks, drill bits, etc. Its aggressive bite & non-loading properties are ideal for sanding wood as well as for use on various non-ferrous & tool steels.AUTOMOTIVE applications:Perfect for shaping metal, deburring tubing and any custom metal fabrication.