The Bead Bandit - hottest new finding in town. This is a threaded tube with a loop on the end, and a screw with a hole in it. Thread your beading wire through the hole, secure with a crimp or knot, and screw on the end with the loop. Hides the crimp, knot, or messy end. Awesome. Inside tube is 2.5 mm - so keep the knot or crimp smaller than that! You get a pair - one for each end of the necklace, bracelet, etc.
4mm x 9mm By the pair.