The 600 Grit TR100 (photo shown is 150 Grit) is a tapered diamond bur with a rounded end. The approximate head length is 10mm, the approximate head diameter at the base is 2.7mm, and the approximate head diameter at the tip is 1.8mm. 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 smoothing areas on a carving or free form and getting them ready to be polished. The 600 Grit is intended for smoothing, blending, and pre-polishing. It will not remove much material, and will leave you with a smooth, matte, pre-polished finish. As with all Lasco Diamond Burs, the 600 Grit TR100 is a high quality, durable, 100% Natural Diamond bur, and is made in the USA. The TR100 is also available in 100 Grit, 150 Grit, 200 Grit, 400 Grit, and 600 Grit