Perfectly balanced for ultra-smooth cutting action. The geometry of the bit allows it to cut smoothly in either clockwise or counterclockwise directions, making them perfect for both right or left-handed techs. The Large Barrel Medium grit Silver Carbide Bit is used for surface work, shortening acrylic and gel products, backfill cutting, and c-curves. The only difference between a large-barrel bit and a small-barrel bit is the circumference of the bit, allowing for nail techs to choose their preference. Made for e-file machines with a 3/32" collet closing mechanism.