The Smooth Top Carbide Drill Bits Are Rounded At The Top With Straight Barrels To Protect The Cuticles And Side Walls From Scratches And Cuts Upon Contact. This Carbide Drill Bit Only Fits 3/32'' Shanks, However, It Comes In Two Barrel Sizes (Small And Large) For The Nail Tech'S Surface Coverage Preference. The Smooth Top Drill Bits Also Come In 9 Different Grit Sizes (Ranging From Extra Fine To 5X Extra Coarse) And 2 Different Colors (Gold And Silver). Best For Nail Techs Who Are Working On Artificial Nails, The Drill Bit Has Many Uses: From Shaping, Carving, Smoothing, Back Filling, And Removing Gel.