Water Gremlin’s Snap-Lock Dempsey Swivel is one of the world’s most versatile, easy-to-use sinkers. It works great for bottom or drift fishing. Snap-Locis patented eye easily snaps on and off your line. There’s no twisting, tying, fuss or line damage. The Snap-Lock eye is great for free-line fishing because it slides free on your line and goes right to the bottom. And that means the fish can take your bait without feeling the sinker weight.