4000104 GBC CombBind Standard Spines, 3/4" Diameter, 150 Sheet Capacity, Black, 100/Box

CombBind 19-ring binding spines bind up to 160 sheets of letter-size documents. Design allows you to add and remove pages with any comb-bind machine for quick edits. Rigid PVC plastic won't scratch, chip, peel or discolor. Standard, 3/4" diameter spines are compatible with GBC and other plastic comb-binding machines.