Swingline GBC 9775028 WireBind Spines, 1/2" Diameter, 115 Sheet Capacity, Black (Box of 100) WIREBIND SPINES  Permanently bind documents with these professional spines when presentation and quality are primary concerns. Ideal for busy corporate offices, universities and accounting firms. 115-SHEET BINDING CAPACITY  Sturdy black spines are the perfect choice for larger projects. With a 1/2 diameter, they securely hold 115 pages, leaving plenty of space for your work. 360-DEGREE CAPABILITY  This sturdy binding allows 360-degree rotation. Spines also allow pages to lie flat for reading, note-taking and photocopying. Great for creating study guides. 32-HOLE BINDING  WireBind spines bind pages through 32 holes, with a steady 3:1 pitch, which creates two loops per inch. PERFECTLY PERMANENT  Attractive, black wire spines give projects a strong, permanent binding with a neat, high-quality appearance. They're an ideal combination of precision and permanence. CONVENIENTLY COMPATIBLE  WireBind spines are designed to be compatible with WireBind machines, creating a simple, hassle-free binding. 100 PER BOX  A box of 100 spines ensures long-term productivity for all of your binding projects.