Originally designed for the harsh demands of rock climbing and mountaineering, Kango’s industrial-grade swivels are popular for all kinds of rigging and hanging demands indoors and out. From hanging swings to dance and acrobatics. Use one anywhere where free rotation without twisting and tangling ropes and lines is needed. Aluminum Alloy with anodized finish. Maintenance-free sealed ball bearings provide silent, frictionless rotation under load.