Completely coated with fine diamond particles for working with hard materials. The diamond coating on the 545 Diamond Wheel adds durability and longevity, while producing smooth & fine cuts. Holes in the face of the wheel keep it cool during use. The Diamond Wheel features 1-1/2 In. (38.1mm) diameter making it ideal to cut, saw, and carve in hard materials such as marble, concrete, brick, porcelain, ceramics, hard epoxy, and soft or hardwood. Includes 402 mandrel.