CMT 694.011.31 45 degree Lock Miter Cutter Head, 5-1/2-Inch Diameter, 1-1/4-Inch Bore Heavy duty aircraft aluminum body, manual feed, pins for automatic knife positioning. Manual feed, pins for the automatic positioning of the knives. Accurately create boxes, stretcher bars, frames and any right angle or parallel joint projects. Excellent results in most materials but ideal in solid wood & in coated/uncoated man made materials. RPM between 5500 and 9500.