The 600 Grit SG2 (photo shown is 150 Grit) is a wheel shaped diamond bur. The approximate head length is 3mm, and the approximate head diameter is 5mm. This bur is great for grinding or carving all types of stone, glass, tile, metal, wood and more... Inverted cones are great for undercutting. 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 SG2 is a high quality, durable, 100% Natural Diamond bur, and is made in the USA. The SG2 is also available in 80 Grit, Grit, 150 Grit, 200 Grit, 400 Grit, and 600 Grit.