Wilson Jones Hanging Dubllock Round Ring Poly Binder, 8.5 x 11 Inches, 1-Inch Capacity, Black (390-14B ) Hooks pull out to hang and retract for active use Fits most standard file drawer racks or mobile units DublLock round ring mechanism locks sheets in so they won't fall out Three position trigger to open, close and lock prevents rings from gapping or accidentally opening Label holder on spine for quick identification of contents