WARNING: California’s Proposition 65 Product Description: TruBind Plastic Spiral Binding Coils: High Quality Binding Coils: Get more done with TruBind. Our high quality binding spines are available in several different types, colors, and sizes to help you stay organized and ready for any binding project. Often used to bind office reports, presentations, manuals, handbooks, school projects, planning calendars, and more - TruBind binding spines are a must-have for any workstation. For best results, use with TruBind binding machines and binding covers. Shop by: Coil Size Coil Length Color QUALITY MATERIALS - Durable polymer construction designed for professional use. Flexible yet built to prevent snagging and cracking. Great for business proposals, reports, menus, and other binding projects. PRE-CUT COILS - Each TruBind coil is 12 inches long and fits a letter-sized book, document, or binding project perfectly. Coils have plenty of excess length, for crimping the ends for a professional, finished presentation. PRE-SIZED COILS - 18mm (11/16 in.) diameter to bind up to 155 sheets of standard 20# copy paper. Maximum binding capacity of 21/32 inches in thickness. Perfect for most office projects. 4:1 PITCH - 48 loops per 12 inch coil. 4:1 pitch matches the 4 holes per inch punching pattern on your document / project. UNIVERSAL COMPATIBILITY - Recommended for use with TruBind Spiral Binding Machines like the TB-S20, TB-S20A, or TB-S20AP. Also compatible with other 4:1 coil-binding machines.