1、WIDE COMPATIBILITY: QGB extension bracket is compatible with for Nagra iv S, for Nagra iv SJ, for Nagra iv E, for Nagra iv 4.2 reel to reel player, which can meet the needs of different devices. 2、FUNCTION: This extension rack can convert the stereo tape recorder professional 5 inch tape reel to 7 inch and 10 inch tape reel, more flexible and convenient to use. 3、PERFECTLY APPLICABLE: It supports 4 speeds and functions of the original reel to ensure that it can run and work properly and bring you a good using experience. 4、PREMIUM MATERIAL: Made of professional studio grade CNC aluminum block, hard anodized to harden the surface and effectively prevent oxidation, ensuring good recording quality. 5、EASY INSTALLATION: The kit comes with 1 QGB extension bracket, two rubber bands, two adapters and two screws for fixing, easy to install, keep the machine working steadily.