Erica's Bit | Carbide Large Barrel - CoarseThe large carbide barrel bit is used for fast cutting with a smooth finish. Use to thin out product, reduce thickness, shape acrylic or hard gel, carve out smile lines or remove lifting pockets. Left hand options available. Optimal use at 15,000 20,000 RPM with an Ericas ATA electric file. RPM will vary depending on technique, e file and freshness of bit.