Indicator/Warning Lamps in a Choice of White/Green/Red/Yellow or Blue. In a Choice of 12V/24V and 230V 22mm Hole Size required, Lens is 28mm Approx Diameter Overall Length is 50mm, Length behind the front mounting is 35mm The Diameter of the Lens is 28mm Approx, Threaded part Diameter is 22mm, the rear base Diameter is 20mm The Cables/Wires enter from the side and the holding Screws are at the rear and are Pozi 1/slotted.