GBC Color Coil Binding Spines, 30 mm, Black, 100 Pack

Strong coil-bound spines provide a permanent binding solution when presentation and quality are primary concerns Excellent for use in busy corporate offices, universities, engineers, architectural or construction firms High quality coils are flexible and stylish, giving your projects a professional image. Sturdy 30mm coils have a 240 sheet capacity and 12" length." 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 loops per inch.