Whiteside RFTD5125 Spiral Flush Trim Down Cut1 2"SH, 1 2"CD, 1 1 4"CL Providing state of the art results in flush trimming. The bit uses a double ball bearing pilot to run against your project template while the down cut flutes expel chips down and away from the router, leaving a smooth top surface. Materials: Natural woods, composites, hard plastics, thin aluminum Recommended RPM: 16,000 18,000 (max 24,000)