Hook Lock / Plug to suit any skirted trolling lure. Made of neoprene rubber, these rig stoppers (hock locks) are designed to be glued to the back face of any skirted trolling lure to maintain the set of the game hook rig. Glue with Zap-A-Gap or Super Glue to the back of the trolling lure head and fix the location of the hook rig by pulling the leader crimp into the centre hole of the stopper.