"It may not actually thump that lethargic bass on the head, but the Strike King KVD Hard Knock Squarebill Crankbait will definitely get his attention. Like the VanDam original, it'll bounce and deflect off cover, constantly wandering with an erratic searching action while still running true; that's enough to spur most bass into action. But this Hard Knock version replaces the standard BB rattles with a single large ""knocker"" ball, and the deep, reverberating thud it emits is unlike that of any other bait. It speaks to bass on a primal level, and they respond simple as that. Also great when long, accurate, water-covering casts are needed. Single hard ""knocker"" ball inside Produces a deep, reverberating thud Different from other underwater sounds Primal sound forces bass to respond Cover-deflecting square bill Erratic wandering action"