Barrel clasps are great for finishing the ends of necklaces. Some jewelry wearers prefer this style of clasp because the screw action is easier for some people to open and close than the triggers on spring rings and lobster claws. Most of the barrel clasps below tighten and loosen with screw action. The spring loaded barrel clasp works by twisting a peg into a notch. To use these clasps, attach the outside loops to the ends of your stringing or beadwork with jump rings or crimps.