Bosch 1/16-in 3-Wing Slot Cutter in the Slotting Cutters department at Lowes.com
Yonico T Slot 7/16 in. Dia 1/4 in. Shank Carbide Tipped Router Bit 14190q - The Home Depot
Freud Slot Cutters
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
CMT - 822.316.11A Slot Cutter with Arbor And Bearing Router Bit 1/4"SH 1/16"H 1-7/8"D