The 150 Grit T22 (photo shown is 150 Grit) is a tapered diamond bur with a flat end. The approximate head length is 10mm, the approximate head diameter at the base is 5.1mm, and the approximate head diameter at the tip is 4.1mm. This bur is great for grinding or carving all types of stone, glass, tile, wood and more... It works especially well for creating small carvings. This shape works especially well for blending areas on a carving or free form. The 150 Grit is intended to be used for cutting or grinding, and works best for roughing out your basic shape and doing your design work. The 150 Grit cuts most types of materials while reducing chipping and pitting of the material being cut. As with all Lasco Diamond Burs, the 150 Grit T22 is a high quality, durable, 100% Natural Diamond bur, and is made in the USA. The T22 is also available in 80 Grit, 150 Grit, 200 Grit, 400 Grit, and 600 Grit.