These were designed for use with the 'Safe Zone' flying back leads. The hole inside the fishing bead is tapered so if it is fished with the larger hole facing towards the rod then it will pass more easily over a leader knot. The small hole will then rest against the top of the anti-tangle system stopping the large bore of the back leads from sliding down the anti-tangle system which would stop the flying back lead 'flying' back on the cast. They are also ideal for the shocker rig, which incorporates a running inline lead with a back stop set a few inches behind it on one of our new leaders or on a length of rig tube.