GBC Binding Spines/Spirals/Coils, 18mm, 140 Sheet Capacity, 4:1 Pitch, Color Coil, Black, 100 Pack (9665080) 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. 140-SHEET CAPACITY  High quality coils are flexible and stylish, giving your projects a professional image. Sturdy 18mm coils have a 140-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. EASY TO USE  Convenient coils are designed for use with all ColorCoil Machines (sold separately). 100 PER BOX  A box of 100 coils ensures long-term productivity for all of your binding projects.