• 21-piece complete set: includes 7 special UNC bits for under-nail cleaning, 2 ball bits, 2 flame bits, 2 brushes, and 8 ceramic bits. • High-quality materials: made of high-precision diamond and high-resistance ceramic, sharpness and durability for prolonged use. • Universal compatibility: the 3/32 inch (2.35 mm) shank fits most electric or rechargeable nail file machines. • Versatile functions: designed to clean cuticles, remove gel and acrylic, polish, shape edges, and remove dead skin. • Organized storage: includes a compact and transparent dustproof case for easy identification and transport of the tools.