used for securing the wheels of motor vehicles the transition between the body 2 and the portion 3 may be formed as a conventional centering cone 14 fig2 the body 2 is axially elongate being for example 7 5 cm long at least very substantially longer than the usual nuts or bolts used in this context fig2 shows the members in use on a wheel hub 5 of the aperture type where a wheel disc 13 is usually secured by bolts 6 screw threadedly engaging apertures 7 for converting this wheel the bolts 6 fig2 b are removed and the male portions 3 are screwed one by one into the vacated apertures 7 fig2 a when they are all positioned there is an array of female portions 4 mimicking the disposition and size of the apertures 7 an end disc 8 may be secured to the ends of the members 1 remote from the wheel disc 13 by using the bolts 6 previously a looped end of a line may have been slipped over one of the members 1 as will be explained fig3 shows how the same members 1 may be used for the conversion of a wheel where the hub 9 has screw threaded projecting studs 11 a wheel disc 13 is usually secured by cap nuts 12 on these studs fig3 b for conversion these are removed and replaced one by one by members 1 this time with the portion 4 being screwed onto the stud 11 a disc 8 is secured to the remote ends by using the nuts 12 on the male portions 3 of the members 1 fig4 a and 4b.