♥ Tapered Barrel Nail Drill is a cone shaped bit with a flat top like a barrel bit. Perfect for the under nail cutter and the surface work. It is also used for a backfill cutting, because of the small circumference at the top. | ♥ Grit: Fine | ♥ Head Dimension: Dia.5.2 mm * 10.3 mm / 0.2 inch * 0.4 inch | ♥ Shank: 3/32 inch ( 2.35 mm) | ♥ Made of High Quality Tungsten Carbide, 100% New