Check the listing for details. 100 Pcs 8mm 5/16" Plastic Binding Combs 40 Sheet Capacity 21 Rings Red. Condition: New. Listed at 20.05 USD. These plastic binding comb spines are suitable for various office occasions and provide great convenience for file storage, file binding, paper collection, etc.It is a portable product for office and study.SpecificationInner diameter: 8mm (5/16 Inch)Length: 300mm/11.8 Inch;Number of binding pages: 40;Material: plastic;Color: Red;Packing List: 100 Pcs Plastic Binding Comb SpinesAdvantageThe binding comb spines are made of long-lasting, strong plastic to ensure long-term productivity for all your binding projects, allowing you to easily bind papers and preserve them for a long time.InstructionThese binding comb spines are designed in 21 rings, making them suitable for any 21-hole rubber ring binding machine. Binding spirals provide a 360-degree page-turning rotation capability for easier reading.