5 GOOD QUALITY ENGLISH MADE SOLID BRASS SWITCHED STANDARD BAYONET FITTING FOR SAFETY LAMP BULB HOLDER..ITEM HAS A 10MM THREADED ENTRY AT THE BASE AND ALSO A SHADE RING.THE SWITCH CANNOT BE USED UNLESS A BULB IS IN PLACE..PERFECT AS A REPLACEMENT, OR FOR MAKING YOUR OWN LAMPS..IT MEASURES 6CMS TALL,3.1CMS MAXIMUM DIAMETER AND 2.4CMS NECK DIAMETER..2 3/8 INCHES TALL,1 1/4 INCHES MAXIMUM DIAMETER AND 1 INCH NECK DIAMETER................LOOK IN OUR EBAY STORE UNDER OTHER CATEGORY FOR MORE LIGHT FITTINGS. Thanks For shopping with UP5ALES. Kind Regards