Premium Carbide Burs provide outstanding cutting speed, durability, and value. Can be used in Electric Handpieces, such as Dremel units. Ideal for Dental Laboratories, Hobbyist's, Woodworkers, Carpenters, etc. For use on plastics, ceramics, porcelain, plaster, acrylic, stainless steel, etc. Lab burs are NOT for Intraoral use! Individually packed 2.3mm shank ( 3/32")