Designed for binding oversized documents like blueprints and manuscripts, small-scale projects like swatchbooks, and everything in between, screw posts are an inexpensive binding solution for practically any document! Our black aluminum Chicago screws allow you to securely bind loose pages together with minimal effort. In addition to being reusable, screw posts are also the only binding method that requires no specialized binding equipment or machines in order to use. Simply insert a binding post into a pre-punched document and tighten to bind - it's that easy! Available in lengths from 1/8 in. to 5 in. (with extensions in four sizes), each screw post's diameter is 3/16 in. For more on screw posts, read our article:“Getting to Know Screw Posts”.