The GSP39WB features a screw-in standard wall mounting system and the innovative Hercules Auto Grab System (AGS) yoke: the arms turn in and up with the weight of your guitar to hold it securely and simply open up when you lift it off. Also features an adjustable yoke, which pivots left and right so you can face your instrument left, right, or front. The yoke is completely covered with Specially Formulated Foam (SFF) rubber to protect your guitar's finish. Features Screw-in standard wall mounting system Auto Grab System (AGS) yoke Adjustable yoke Specially Formulated Foam (SFF) rubber