Swingline GBC 4200022 CombBind Standard Spines, 2" Diameter, 500 Sheet Capacity, Black (Box of 50) CONVENIENT COMBBIND  CombBind spines allow pages to lie flat for easy reading. Sturdy spines won't scratch, chip, peel or discolor over time. Reliable spines are excellent for busy corporate offices. 19-HOLE PLASTIC SPINES  With 19 holes, durable CombBind spines provide a steady, secure binding, and a reliable choice for almost any project. 500-SHEET CAPACITY  Shiny, black spines provide plenty of space to house your printed projects, comfortably securing 500 pages per spine. 2" diameter spine size. EASY TO USE  Convenient, multi-purpose spines are designed for use with all CombBind Machines (sold separately). Sleek spines look great with GBC ClearView and Regency covers. 50 PER BOX  A box of 50 spines ensures long-term productivity for all of your binding projects.