FLATS LOK Jigheads feature a sharp but tough, black nickel Kitana^TM hook and come in 4 sizes and 2 colors. FLATS LOK Jigheads are among one of the almost perfect choice for any saltwater soft plastics and were specifically designed to work with the Castaic swimbaits.pro lures custom built by Bestac Just to thread the bait onto the hook, then screw it into the threaded lock-on metal coil custom built by the Bestac team. No need to worry the constantly re-adjusting the plastic as it slips down the hook shaft. Each pack of Flats Loks contains 5 jigheads.