TOTiyea 50 Pack Double Loop Wire Binding Spines,1 Inch Diameter,2:1 Pitch,21-Loop, Black, 220 Sheets Capacity, Letter Size

Sheet Capacity: These double loop wire binding spines can hold up to 220 sheets of paper(20lb,80gsm). High Quality: The binding wires are made from high-quality wire that are sturdy and allow you to compile paper sheets with ease and store for a long time. Perfect Size: Each wire binding spine measures 1 inch in diameter and 0.8mm in thickness. Each spine has a 2:1 pitch and 21 double loops; 360-degree rotation. Binding wire: Use these double loop wire binding spines to bind important documents, files, or reports for an upcoming presentation or project. Compatible with most wire-binding systems (2:1 pitch and 21-hole pattern)