Abstract: Disclosed herein is a single piece molded locking snap ring assembly for use in holding looseleaf sheets together as in a two or three-ring binder. The assembly is a one-piece molded construction including an elongated longitudinal base section having upright retaining levers at each end, extending between two pivotally opposed ring support sections. Integral reduced cross section living hinge sections joining the base and ring sections and provide pivotal connection therein. The ring sections carry opposed ring segments for movement toward and away from one another into closed and open positions respectively. Integrally molded locking arms mounted at each end of the ring support sections carry free ends having oblique surfaces for contacting and pushing respective levers outward and projecting ledges having latching surfaces for latching with central channels defined in the levers.