1Made from premium materials, it is of high hardness and long durability for fine processing. 23mm shank can be installed on many electronic grinder, carving machine and other electric or pneumatic machines. 330pcs different grinding head, economical and practical. 4Widely used on ceramic, glass, stone, carbide alloy, jade and so on. 5Excellent for fine detail work, such as grinding, carving, touch-up and finishing.