The distinctive solid brass bumble bee door knocker Overall Length(from the top of the antenna to the bottom of the stinger):6.7in - 17cm W:6.3in - 16cm Depth: 2.2in - 5.5cm Weight:1.6lb - 710gr Suitable for use on external or Internal wooden , UPVC and composite doors so long as you can drill into the door. Easy surface mount fixing - securely screwed in from the front of the door with two screws. This method of fixing involves screwing the door knocker into the door from the front, with no fixings visible from the rear side of the door. Mounting screws are included. Anatolica Bumble Bee Door Knocker with Antenna and Stinger,Brass, 6.7 inch Tall