CMT 694.100.31 Rabbeting Cutter Head, 4-Inch Diameter, 1-1/4-Inch Bore Heavy duty aircraft aluminum body, 2 carbide knives (50x12x1.5mm), 4 scoring knives (14x14x2mm) Manual feed, pins for the automatic positioning of the knives Ideal for coated and uncoated man made boards, plastic material and hard/softwood Use with spindle moulder machines, double-end tenorers, edging machines RPM between 7500 and 12500