The SMC Rescue Swivel is built around a heat-treated steel axle and a sealed high efficiency ball bearing to ensure flawless rotation during even prolonged and difficult raises in severe rock, mountain and rescue conditions. The holes are sized to work with rescue carabiners, and allow carabiner lock sleeves to pass without hanging up. As one of the most compact swivels on the market, it is ideal for confined space rescue and other awkward hauling situation. The sides are smooth and rounded, helping to prevent hanging up on rocks, litters, or other components or structures.