1-Inch 2:1 Twin Loop Binding Wires - EW21L01 - Durable - 2:1 Pitch (2 holes/inch) - 11 Inches Long - Pre-Sized to Fit Letter-Sized Paper - Compatible with 2:1 Wire Binding Machines - 50 per Box QUALITY MATERIAL - Each binding wire offers security and durability at an affordable price. These wires are perfect for reports, presentations, calendars, sketchbooks, as well as other binding projects that require an additional level of sophistication. 11 LENGTH - These wires are designed to be used with Letter sized documents. However, they can also easily be cut with wire cutters to accommodate books with spines smaller than 11 inches in length. When cut, they can then be used with a binding machine equipped with disengaging pins. 2:1 PITCH - These twin loop wires have 2 holes per inch and 21 total loops. SHEET CAPACITY - These wires hold approximately 220 sheets of 20# paper, with a maximum binding capacity of 7/8 inches in thickness. COMPATIBLE MACHINES - Twin loop wires can be used with a 2:1 wire binding machine or any wire closer. They are fully compatible with all standard wire binding machines.