Structured Diamond Abrasive (SDA) 30mm x 30mm is the ideal solution for Spiral Reamers. SDA can be used wet or dry and is available in many different sizes. It can be used on granite, marble, engineered stone, composites, glass, ceramic, thermal spray coatings, thermal barrier coatings, concrete. limestone, sandstone and all natural stones. SDA as the lower cost diamond alternative is also the ideal replacement for Silicon Carbide or other sandpaper spirals. Longer lasting, more consistent finish and predictable results. KGS as a manufacturer can make any size spiral reamer. If your size is not listed under the standard sizes please contact the KGS Sydney Office to discuss your particular requirement.