Brass honeycomb bee door knockers are supplied with 4 screws which are easily attached to any type of door whether it be wooden, UPVC or composite doors. The top of the bee is screwed to the door using the 3 screws provided which go through the top plate and no screws will be visible on the inside of the door. The 4th screw is for the striking plate and is screwed from the inside of the door into the striking plate which sits just under the bottom of the bee’s body.