Flexible Capacity: Binds 25–100 sheets of 20 lb (80 gsm) paper—ideal for reports, presentations, and manuals. Vibrant Color Options: Includes Black, Gold, Blue, White, and Silver to match any style or project. 3:1 Pitch Compatibility: 32-hole, 1/2" (12.7 mm) diameter design fits standard 3:1 pitch wire binding machines. Letter Size & Custom Fit: Supports letter-size paper or smaller; trim oversized sheets for a perfect fit. Secure Permanent Binding: Keeps pages neatly bound for long-lasting, professional results.

Wire-O binding wire, also known as “duo-wire” or “twin-loop binding wire,” offers a secure and professional finish for your documents without sacrificing style or affordability. These 3:1 pitch wires are precisely engineered to match the 3:1 hole pattern (three holes per inch, totaling 32 holes on a standard letter-size sheet). Each wire measures 11 inches in length with a 1/2-inch diameter loop, perfectly sized for binding letter-size documents.

The wires can also be easily trimmed with wire cutters to fit smaller projects and used with any binding machine equipped with disengaging pins. Rayson Wire-O binding wires are fully compatible with all standard 3:1 pitch wire binding machines, including models from other leading brands.

Made of heavy-duty metal, these spines provide exceptional durability and a polished look, making them ideal for reports, presentations, calendars, manuals, and creative projects. With 100 pieces per box, you’ll have the quantity you need for both small and large-scale binding jobs, all at excellent value.