Three wing slot cutter - Industrial router bits

I'll be routing out the main floor to slot the border in and have been looking at 18” slot cutter bits, however there also seems to be a

woodworking tools and accessories: router bit, spiral bit, shaper cutter, bandsaw blade, circular saw, cold saw, planer knives, end mills, metal working

168 slot online Buy LIEUTENENT V TYPE SLOTTING CUTTER ROUTER BIT 934 CUTTING SIZE X Rotary Bit Set for online LIEUTENENT V TYPE SLOTTING CUTTER ROUTER

188 slot Yonico 18 x 516 Top Bearing Slot Cutter Router Bit $1795 current price Router Groove Biscuit Joint Bit Slot Shanks Cutter Bits Woodworking Engraving