I carry my bike keys on a neck lanyard. They all have a black plastic clip with a string loop on it. So my silly question is, whats it supposed to be for!
Feed the clip thru the string loop around your belt or something to hold your keys when off your bike I would imagine.
It's for holding your willy in the vertical position when you are doing up the zip on your leathers............ AL
It's to attach a name tag then when someone finds you out after dark they know where to hand you in .
It's a mobile phone or camera holder. You thread the string bit through the suitable loop on your phone. You can then unclip / use / clip back on.