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Features: *30pcs Alloy Burr Bits Drills for Nail Grinding Machine *Includes 30pcs various shapes and coarseness burr bits *Can meet your different needs *With 3.0mm shanks diameter *The main head shape: flat cylinder, round cylinder, sphere, umbrella, bullet-type, etc. *Fit for most of the professional electric drills, best for replace nail drill bits *Widely used in the polishing and grinding jade, glass, ceramics, metals, nuclear carving etc. *100% Brand New and High Quality Specifications: *Material: Alloy *Color: As Pictures Show *Length: 45mm/1.77 inches (Approx.) *Shank Diameter: 3.0mm *Quantity: 30pcs Package Contents: 30pcs Alloy Burr Bits