When you need an elegant, professional 11-inch by 17-inch binder for an important client presentation or business meeting, look no further than this black acrylic screw post binder from Ruby Paulina. It features standard 3-hole punched ring spacing with rigid smooth panels, an aluminum piano hinge and nickel plated fasteners. The corners are rounded and the cover has a glossy finish for a handsome appearance. Screw post extensions can be added for additional capacity, and are sold separately. The binder is pictured with a 1-inch extension.