Milescraft For Use On Interior Doors Single Door Kit (Fits Up to 80-in Door Width) in the Door Installation Kits department at Lowes.com
Door Hinge Jig, Door Hinge Mortiser, Hinge Installation Kit, Door Hinge Router Template Fits for Door Hinge from 3” to 5” Length and 1/4” or 5/8” Thickness. - - Amazon.com
Trend Two-Piece Professional Hinge Jig Kit with Long Reach Router Bit & Guide Bush for Recessing Hinges in Doors & Frames, H/JIG/A - - Amazon.com