Yonico Slotting Cutter Router Bit 1/4-Inch 1/2-Inch Shank 12107 : Amazon.ca: Tools & Home Improvement
55500 E-Z Dial Slot Cutter 4 Wing x 2-1/8 Dia x 1/8-1/4 x 1/2 Inch Shank: Router Bits, Jointing Router Bits, Adjustable Slotting Cutter Router Bit Sets