These end caps are sized for 4mm (3/16 inch), 6mm (1/4 inch) or 8mm (3/8 inch) inch braids. Use a few drops of Elfy Super Glue (the one we include in our big kit), Gem Tac, E6000, or other glue that will bind your cord to metal, insert the prepared end of the braid, let it dry, and you are ready. The clasp is already attached to the end caps.
To prepare the braid end, you need to tie them off with strong beading or other heavy duty thread. Loop the thread as pictured below, wrap one end around several times and tie it to the first end using several knots. Snip the protruding braid cords, and cut off the excess binding thread. The clasps come complete with a set of illustrated instructions:



Remember, you are getting two sets of clasps in each package, enough to finish two necklaces.