GBC Binding Spines/Spirals/Coils, 12mm, 90 Sheet Capacity, 4:1 Pitch, Color Coil, Black, 100 Pack (9665040) STURDY, COIL-BOUND SPINES  Strong coil-bound spines provide a permanent binding solution when presentation and quality are primary concerns. IDEAL FOR BUSY OFFICES  Excellent for use in busy corporate offices, universities, engineers, architectural or construction firms - anywhere that presentation and durability are priorities. 90-SHEET CAPACITY  High quality coils are flexible and stylish, giving your projects a professional image. Sturdy 12mm coils have a 90-sheet capacity and 12" length. 360 DEGREE ROTATION  Coil bindings lie flat for easy reading, with 360 degree rotation capability for added convenience. Spines are designed with a 4:1 pitch, which equates to 4 holes per inch. PERMANENT BINDING  These professional-looking coil bindings provide a permanent solution, securely holding pages together. They cannot be unbound for editing or rearranging.