The lead climber typically connects the rope to the protection with carabiners or quickdraws. Non-locking carabiners are commonly found as a component of quickdraws. Ropes are usually rigged using bolts, slings, and carabiners. The rig typically consists of support chains, a webbing strap, a silk hammock and carabiners. A via ferrata set comprises a lanyard and two carabiners. Pitons and carabiners were just starting to be effectively adapted for use in the mountains. The traditional self-belay system basically consists of two carabiners operated by the participants. A quickdraw consists of two carabiners connected by a semi-rigid material (sometimes called the "dogbone"). Novelty carabiners are also commonly used as keyrings for ease of access and exchange. There are two major varieties&colon; locking and non-locking carabiners. Most locking carabiners utilize a straight-gate. Twist-lock carabiners are commonly referred to as "auto-locking carabiners" due to their spring-loaded locking mechanism. There are several different types of locking carabiners, including a twist-lock and a thread-lock. Locking carabiners offer a method of preventing the gate from opening when in use. These cables, often referred to as flying wires, are connected to the basket by carabiners.