The 19 hole comb binding ring fits letter sized paper (8.5 x 11.0"). Sheet Capacity: 90; Spine Diameter: 1/2"; Number of Rings: 19, length: 10.7"/ 27.2cm Get a professional edge! Quantity/Unit - 100/Box Available to bind 2-90 page documents. 3mm margin for binding 2-90 sheets ( max. binding thickness: 9.5mm/0.37in), 6mm margin for binding 60 sheets ( max. binding thickness: 8mm/0.31in). Designed for a variety binding of paper size. Perfect for internal reports and functional documents. Success is all about presentation.From sales presentations to educational materials and financial reports. Rayson 19-ring Binding Comb is designed for a variety of document finishing systems to help you catch the attention of your audience and student with Colorfulness;

Rayson comb ring offer a variety binding of paper size, binding letter size (8.5"x11.0") paper and below with Sheet Capacity: 90; Spine Diameter: 1/2"; Number of Rings: 19.