A very common and effective way to present baits to bottom fish such as grouper and snapper. A more stealthy method for fish that can be leader and hardware shy. The sinker rides free on the main-line which ties to a barrel swivel. The length and material of the leader varies, but then attaches to the hook. The angler is able to feed the fish through the sinker so that the fish does not feel the weight of the sinker on the bite.