Dremel 1.000000 oz. Rotary Tool Diamond Wheel is for cutting, sawing, carving, sharpening, and filing hard materials. It works effectively on marble, concrete, brick, porcelain, ceramics, hard epoxy, soft and hard woods. With a diameter of 22.2 mm, a thickness of 0.6 mm, and a speed rating of 20,000 rpm, this diamond wheel is suitable for use with hand grinders. It includes a 402 mandrel for easy attachment and removal. The 545 diamond wheel is completely coated with fine diamond particles for working with hard materials. Designed to be long-lasting and not lose its shape or break, it provides smooth, fine cuts.