Micro Chisel cutters have small-radius working corners for excellent performance and ease of maintenance. Blued cutters provide corrosion resistance and improved strength. X grind improves out-of-box sharpness with substantial speed improvement in boring and bias (undercut) modes. Vibe-Ban chassis design reduces vibration 25% or more at the handle. Sharpens with 3/16 In. file. H (333SL)