This bulb reflector is 45mm in reflecting diameter with a 2.5mm lip giving it a total diameter of 47.5mm. The length from the reflecting end to the end of the screw is 12mm. The screw diameter is 21mm by 10.5mm long. Thread size is 1.5mm apart from each other and has 3 threads. The total length is 31.5mm. Fits most standard flashlights.
