MICROJIG Matchfit MB-025-0514 Dovetail 1/4 Shank 14° X 1/2 Router Bit,

Works great. Make sure the depth is correct. Cut to shallow and the clamp protrudes above the groove

Good durable, but expensive. Bought these with Micro Jig DVC-538K2 MATCHFIT Dovetail Clamps to use on miter saw table I built. The bit started to slide out while is use causing cut to go deeper. But slots still work. It would be nice if included with clamps at least option, which are also expensive.