9.5mm Wire Binding 34 Ring are designed for use with any 3:1 Pitch Wire Binding Machine and give a professional touch to your reports, submissions and presentations. 9.5mm Wire Binding Coils 34 Ring are also known as Twin Loop Binding or Wire Binding Combs, and provide strong and permanent binding of documents. When books are bound with wire they lay fully flat when opened and pages can be completely reversed 360 degrees.