The 80 Grit ICR22 (photo shown is 150 Grit) is a rounded inverted cone shaped diamond bur. The approximate head diameter is 5.75mm, and the approximate head length is 10mm. This bur is great for grinding or carving all types of stone, glass, tile, metal, wood and more... The 80 Grit is intended to be used for bulk removal and rough cutting. As with all Lasco Diamond Burs, the 80 Grit ICR22 is a high quality, durable, 100% Natural Diamond bur, and is made in the USA. The ICR22 is also available in 40 Grit, 80 Grit, 150 Grit, 200 Grit, 400 Grit, and 600 Grit.