The power transfer lead covers are designed to ensure unbroken transfer of wires between the door and frame in electric locking situations.
This prep is suited for hinged doors which open to 90 degrees (maximum of 120 degrees).
When you specify this prep on your order, our frames come with a cutout to suit, and a mortar box. The lead cover is screw fixed to the face of the door frame.
Image of finished prep in Surefab Steel door frame