Very large data bases

In abstract, the preferred embodiment of this invention is a clasp for bands formed in at least two parts with the same being connected through two juxtaposed surfaces, one carrying a plurality of hook means and the other a plurality of loop means. The two portions are held in secured juxtaposed relationship to each other by means of a slidable loop with a lock in closed position. The securing loop is readily releasable by proper manipulation when separation of the two parts of the band is desired.