- 100% brand new and high quality - Diamond coated bur set with 3.175mm shanks - 30 pcs assortment of various shapes and sizes - Bits come in different sizes and coarseness to satisfy any technology. - Fit most professional electric drills, best for replace nail drill bits - Can be used to various applications including carving, grinding and etching on a variety materials. - Burs Length: About 45mm