These circular reflectors have a hole in the centre for mounting with a screw and are suitable for trailers, caravans or other vehicles. Red reflectors are used to mark the rear side of a vehicle or trailer. It is an MOT requirement to have red reflectors on the rear of the vehicle and it is an important safety feature. The reflector is E-Approved which means it is road legal and suitable for use across Europe. The reflector has an overall diameter of 76mm.