Using with Rayson binder TD-12. 32-hole pattern and 1/4 inch, Pitch 3:1, TD-100B4, Perfect for internal reports and functional documents, Especially binding using with Rayson TD-132. Permanent binding keeps pages in place, Binding Capacity, TD-1500B34 or TD-1500B34R wire binding machine. Binding letter size and below size paper. These heavy-duty metal binding spines with :1 pitch and 2-loop are available in a wide range of sizes binding letter size paper, presentations and any other book binding projects, TD-100B4R, 20lb 80gsm, 2-40 sheets, Available in several diameters, : Rayson WR-32-45-100-B Double Loop Binding Wires 1/4 Inches 3:1 Wire Binding 32-Loop Wire Ring Pack of 100 Black : Office Products. perfect for binding reports, cut the over size part.