The HERCULES Auto-Swivel Yoke Hanger GSP39WB rotates automatically so instruments hang evenly and securely. It features a screw-in standard wall mounting system. == Features: == • The Auto-Swivel Yoke with Auto Grip System allows for multi-angle adjustments while safely locking instrument in place. • Screw-in standard wall mounting system. • Specially Formulated Rubber Foam fully protects instrument at all contact points.