TRIATHLON - BIKE NUMBER FLAG MOUNT
Need a place to mount the Number on your tri bike but don't want it on your frame or flapping on your leg? this snaps onto a 27.2 post and gives a nice rigid place to mount number and not mar up frame or rub on your legs.
Snap and Zip tie really easy (I just snap in place)
If you like the Tri Bottle Mount in pic
http://www.thingiverse.com/thing:2289380