These can also be used with nail care machines, as long as the shaft fits.✨ Other uses available!✨ This is a great deal with a set of 30!♡ Product Specifications: Shank diameter: 2.35mm. Consists of 30 pieces, including cylindrical, round-head cylindrical, spherical, egg-shaped, bullet-shaped, dot-shaped, oval, nodular, conical, and inverted conical shapes. High-Quality Materials: This product uses high-quality emery powder, finely polished, beautifully carved, and highly durable. Wide Range of Applications: Ideal for processing glass, metal, stone, wood carving, jewelry making, welding, wood, ceramics, etc. Examples of Use: Can be used for polishing, fine polishing, engraving, wrapping, milling, brushing, descaling, drilling, varnishing, deburring, etc.✦