PORTER-CABLE 43704PC Straight Router Bit
The Porter Cable 43704PC  1" Hinge Mortising Cutter is designed for mortising of doors to accept locks, lock face plates, hinges, and for general stock removal.  All cutters fit 1/4" - 28 threaded shanks.  Specifications:  Cut Capacity - Width 1",  Flute Length 9/16".