SKIL Router Hinge Butt Template Set Model 91804 For Mortising Door and Jamb for 3-1/2 and 4"Butt Hinges Includes Two Templates for the Most Popular Interior and Exterior Hinge Sizes Use 1/2" Straight Bit or Hinge Mortising Bit Requires Router Bit and 5/8" Guide Bushing (not included) Includes Complete Instructions