Binditek 50 Pack Double Loop Wire Binding Spines, 1Inch for Letter Size, 2:1 Pitch, 220 Sheet Capacity, 21-Loop, Black, Students and Coworkers

220-sheet capacity: each double-loop binder measures 1 inch in diameter and 0.12 mm in thickness, which can hold up to 220 sheets of 20# paper. 50 per box: these binding wires are made from high quality metal, with a double loop style to provide security and durability, stable enough for your long-term needs. 2:1 Pitch: These double loop binders have 2 holes per inch, they are compatible with 2:1 pitch binding machines or machines with release pins. 27.9 cm: These 21 double loop buckles are designed to be used with letter size paper, or you can link smaller projects by cutting off the oversized part. Binding: double loop binding wires can gather your files together and organize them to keep them in order, no more scatter or clutter, ideal choice for your presentation, meeting, or office.