This is a holder that holds adapters for TONE ratchet ring wrench.RABT2: ADAPTOR FOR GEAR WRENCH, BIT TYPEhttps://www.tonetool.co.jp/product/detail.php?no=RABT2&bk=searchRA2: ADAPTOR FOR GEAR WRENCH, 1/4 inch square drivehttps://www.tonetool.co.jp/product/detail.php?no=RA2&bk=search