Renz Wire 3:1" 8mm (5/16") 100/box, Black

Renz Wire Binding Rings, 3:1 (34 loops), 8mm (5/16 inches), 100pcs/box, Black color (can bind up to 50 sheets)

Renz Wire Binding Rings come in either 3:1 pitch (3 holes per inch) or 2:1 pitch (2 holes per inch). 3:1 pitch can be supplied from 3/16" (Size 5.5mm) upto 9/16" (Size 14.3). 2:1 pitch can be supplied from 5/8" (size 16mm) rite up to 1 1/2" (size 38mm) allowing a maximium of 340 pages of 80 gsmto be bound.