MAKE PERFECT PREPS for FOR THE SDC WIRELESS POWER TRANSFER. ....PREP DOORS AND FRAMES. WORKS with your Plunge Router with a 5/8" collar. JUST use YOUR CLAMPS ! NO NAILS REQUIRED ! NO NAIL HOLES to FILL !! ROUTER BIT IS Included !! IF YOU HAVE MANY DOORS TO PREP , CONSIDER ADDING A PATTERN BIT for the shallow prep AND USE TWO ROUTERS...Use the PLUNGE ROUTER FOR THE DEEP POCKET AND A TRIM ROUTER FOR THE SHALLOW PREP. This will reduce the time spent adjusting the depth up and down over and over and over again. JIG is HANDMADE IN THE USA !!! CHECK OUT The PICS TO SEE HOW IT WORKS.