The Barnacle is a clamp on M5 threaded boss. Available in lots of different sizes, fit to your frame tubes, seatpost, fork legs. Anywhere you like. Use them to fit bottle cages, Strapdecks, or anything else that you fancy.
** NOTE - PLEASE MAKE SURE ANY BOLTS YOU USE ARE THE CORRECT LENGTH, BOLTS THAT ARE TOO LONG WILL DAMAGE/DENT THE TUBES THAT THE BARNACLES ARE ATTACHED TO