In reply to JJL:
Cuba is a tropical limestone area with a history of bolt failure. The locals wish that donated hardware is either titanium or HCR (2205) stainless steel. Titanium glue-ins are available as are titanium bolts-ins and hangers, 2205 bolt-ins are available but no hangers.
Cheap is not a word to use in connection with any of the above!
Importing into Cuba is only permitted for government agancies and joint-venture companies so you will have to persuade the customs guys the bolts are miscellaneous personal items.