Keyhole Bit 850C Contractor router bits

How to make a keyhole router bit jig keyhole slot bit What do you choose, a circle the diameter of your keyhole bit or what exactly should you draw to choose to make a keyhole keyhole slot keyhole slot This bit routs a groove with an overall diameter of 2564” and a minor diameter of 316”

keyhole slot hanger CMT 850 Keyhole Bit and T-Slot Bit