Holes are pre drilled for ring pro doorbell to simply attach both plate and doorbell to your existing intercom system.
Ring doorbell adapter plate.
Homono waterproof adjustable 30 to 55 degree angle mount for ring video doorbell 1st and 2nd angle adjustment adapter mounting plate bracket wedge kit doorbell not included 4 4 out of 5 stars 1 683 17 99 17.
Remove your original ring video doorbell once you have removed the original ring video doorbell and the mounting plate place the adapter plate with it s smaller side the beveled edge facing the wall.
This adapter plate is used to retrofit a ring pro video doorbell not ring or ring 2 see this listing.
Use the original drill holes you can line up the holes in the adapter plate with the holes left behind from your original ring mounting bracket.
The 3 pcs ring doorbell pro angle mount is specifically designed to work with the ring doorbell pro version only not for ring doorbell 2 or the other ring doorbell.