Crimps and Crimp Covers
Crimps come in hard and soft metal. Hard crimps and most suitable for using to finish the ends of necklaces, while the softer variety is great for positioning around a necklace or bracelet to act as stoppers for beads (known as a floating bead necklace/bracelet). When using a crimping tool, the soft crimp is best.
Crimp covers serve to hide crimps. Once you have squashed a crimp in place, if it is visible, it may be square in shape or rough on the edges; a crimp cover, available in 3mm, 4mm and 5mm will cover the crimp neatly and appear like a small bead.