If you want to catch big blue catfish consistently, learn to bump fish. A good bump rig starts with a BnM 3-Way Bumping Swivel designed especially for this stationary technique in which you slowly walk a bait rig downstream with the current, bumping the bottom all the way. Its incredibly effective, and this super-tough, flexible 3-way swivel does a great job of keeping your line, leader, and dropper properly positioned at all times. Also great for many 2-way applications. Per 3. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Swivels.