Thse M3.5mm Extension studs from Zexum are ideal for extending the length of an M3.5 screw by 35mm. Perfect for when switch & socket boxes are too deep in the wall for an ordinary screw to fit., simply screw your stud to the threaded lug in your wall box, then attatch as normal with an M3.5 screw. Main Features: M3.5 35mm extension stud Ideal for hard to reach wall boxes with an ordinary M3.5 screw Especially useful if the switch or socket has colour matching screws Technical Specification: Threading: M3.5 Stud Length: 35mm These studs are the perfect companion product for Zexum M3.5 Socket Screws