This is a Backplate
Blink Doorbell
This is an inverted box backplate with about 5/16in Inside Space to allow for wire nut and wires to hook up the doorbell. And it can be used to cover larger holes.
Size is 3in Wide x 6in Tall -- Hole Spacing is the same as the bracket on the doorbell.
Doorbell not included
Fits This Doorbell: