The 40 Grit CLR85 (photo shown is 150 Grit) is a rounded cylinder shaped diamond bur. The approximate head diameter is 6.75mm, and the approximate head length is 13mm. This bur is great for grinding or carving all types of stone, glass, tile, metal, wood and more... The 40 Grit is intended to be used for bulk removal and rough cutting. As with all Lasco Diamond Burs, the 40 Grit CLR85 is a high quality, durable, 100% Natural Diamond bur, and is made in the USA. The CLR85 is also available in 40 Grit, 80 Grit, 150 Grit, 200 Grit, 400 Grit, and 600 Grit.