Raven® Vinyl-Guarded® binders offer security, convenience and Ease-of-Use Post binders feature a top lock mechanism with a slide-button cover release for easy sheet changes. Stiff heavyweight board construction and full-length metal hinges on both covers provide maximum durability. Ideal for accounting, shipping and receiving. Center to Center: 8 1/4”, Post Diameter: 5/16”. Binder Type: Post; Binder Style: Non-View; Binder Size Capacity: 2″; Binder Color(s): Black.