Yonico Slot Cutter 1/4 in. L x 1/2 in. Shank Carbide Tipped Router Bit 14181 - The Home Depot
Yakamoz 1/2 Inch Shank Adjustable 3 Wing Slot Cutter Router Bit Set with 6-Picecs Slotting Cutters | 1/2 Inch Cutting Depth & 6 Different Cutting Widths - - Amazon.com