The GTR Duo Lock Snap is a snap made of reinforced stainless steel. The snap holds even under the toughest use. The Duo Lock is a very popular carabiner because it is quick and easy to open. You can use the GTR Duo Lock Snap to make your own leaders. The large sizes of the Duo Lock carabiners are also suitable for pike leaders. The snap can also be tied directly. The small sizes also make it easy to fish micro soft baits or small hard baits. Advantage of the Duo Lock: it closes very securely compared to many other snaps.