Communicate your ideas with professional polish. 19-ring plastic spines won t scratch chip peel or discolor. Bind 11 x 8 1/2 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 . Sheet Capacity: 320; Spine Diameter: 1 1/2 in; Number of Rings: 19; Number of Pins: N/A.