Small Barrel Smooth Top Carbide Nail Drill Bits | Cross Cut | Grit: Medium | Shank Size: 3/32'' | Two-Way Rotation. Cross Teeth Design: With a cross-cut design, safety and quick for smooth shape contour nail gel surface or natural nail. The smooth top carbide drill bits are rounded at the top with straight barrels to protect the cuticles and sidewalls from scratches and cuts upon contact. Two Rotate Direction: Designed to cut smoothly in clockwise and counter-clockwise directions for both two hands. Works for both the left and right hand, you can choose the direction in a different situation. It needs a nail drill that has a forward and reverse function.