Swingline GBC CombBind Standard Spines, 3/8" Diameter, 60 Sheet Capacity, Black, 100/Box -SWI4000044

Communicate your ideas with professional polish. 19-ring plastic spines won't scratch, chip, peel or discolor. Binds 11 x 8 1/2 documents. Perfect for internal reports and functional documents. Editing capability with a machine. Compatible with GBC and other plastic comb binding machines. To select correct diameter, measure thickness of material (including covers) and add 1/8". Model Number: 4000044