Wilson Jones 24165N Raven Vinyl-Guarded Post Binder, 2" Cap, 11 x 17, Black Toplock mechanism with slide button cover releases for easy sheet change. Supported black vinyl over stiff heavyweight boards. Full-length metal hinge on both covers. Includes threaded top post and inner sections for up to 2 inch capacity 5/16 inch post diameter, spaced 8.24 inches apart