A ring binder mechanism includes an elongate housing and a ring support supported by the housing for movement relative to the housing. The ring support has an upper surface and a lower surface. A plurality of rings is provided for holding loose-leaf pages. Each ring includes a first ring member and a second ring member. The first ring member is mounted on the ring support for movement with the ring support relative to the housing between a closed position and an opened position. An actuator is mounted on the housing for pivotal movement relative to the housing for moving the rings from their closed position to their opened position. The actuator has a snap-lock connection with the housing.