From Knightsbridge a dimmable 60W max fixed downlight lampholder (Bulb Not Included). The fitting is double insulated and comes supplied in a chrome finish working on 240V mains. The R63 downlight is suitable for a wide range of commercial and domestic applications and is designed for use with E27 edison screw bulbs. Product Dimensions Diameter 100mm x Recess Depth 130mm. Cut out diameter 80mm.