Black UL Rated USA Lampholder E12 10mm Threaded Entry, Shade Compatible (Lock Ring Not Included)
Width - 33mm, Height - 44.5mm
This lampholder is great if you are converting a fitting for use in the USA as it is UL rated, which means it can be used in the American market legally. It has a 10mm mounting thread and a threaded outer skirt so a shade can be fitted.
Before starting any electrical work, always switch off at the mains. If in doubt consult a competent electrician