Swivels and snaps are used to connect the line leading from a rod to a lure. The swivel lets the lure twist and turn in the water without compromising the integrity of the line. Snaps do not allow the the lure to twist, but instead, act as a stronger connection between the fishing line and lure. There are several types of swivels, some have two rings and some have three. Other types are ball bearings, locks or twist in a barrel motion.
The most popular brands of swivels and snaps at FishUSA include Eagle Claw, Thundermist, Raven, SPRO and Redwing Tackle/Blackbird.