This rig was named because of the effect that it has when picked up by the carp. It should ALWAYS be used with a safety feature of some sort such as a safety clip or soft rubber tubing for an inline lead. The bolt rig has a ‘semi-fixed lead’ attachment not allowing any ‘free running’ of the fish without resistance. This means that when the fish picks up the bait and starts to move away it feels the resistance of the lead weight and bolts partially setting the hook in the process. The safety clip or rubber tubing feature found in all good inline leads will allow the safe shedding of the lead should the fish break off during retrieve, therefore causing no harm to the fish