Open a window to your work. Experience this unique new see-through technology. These discs provide a unique ability to see the surface you are carving as you work. Youll notice an immediate difference. Holey Galahad quickly allows you to shape peaks and valleys into smooth surfaces as you see them, eliminating the need to feel the high and low spots. These extremely sharp, long wearing conical teeth provide superior surface removal with a very smooth action. Made of durable Tungsten Carbide.