Binditek 100 Pack Plastic Spiral Binding Coils Kit, Multi Size Binding Spines, 3:1 Pitch, (1/4", 5/16", 3/8", 1/2"), 36Loops for Letter Size, 4 Different Sizes, Black

• 【Multi Size For Different Needs】There are 4 sizes of black binding coils in this set, each size for 25pcs, include 6mm(1/4"), 8mm(5/16"), 10mm(3/8"), 12mm(1/2"). Each size of binding coil corresponds to a different paper capacity, allowing you to meet various binding needs.
• 【3:1 Pitch & 36 Loops】These spiral binding coils have a 3:1 pitch, meaning they work with any binding machine that punches 3 holes per inch. They are perfectly compatible with Binditek spiral binding machine.
• 【360-Degree Rotation】Plastic spiral binding coils provide a 360-degree page-turning rotation capability for easier reading, allowing bound projects to lay flat.
• 【For Letter Size】These 48-loop binding coils are perfect for letter-sized paper (8.5 x 11 Inches). The length can also be cut with Binditek coil crimpers pliers according to personal requirements.
• 【100 Binding Coils】Durable and strong plastic spiral binding coils ensures long-term productivity for all your binding projects, allowing you to bind paper sheets with ease and store them for an extended period. Ideal for engineering files, business projects, office documents, and university presentations, they serve as excellent gifts suitable for teachers, students, and coworkers.

【Marks for A4/A5/Letter Size】The spiral binding machine is suitable for Letter Size (42 holes), A4 Size (46 holes), A5 Size (33 holes), or smaller sizes. Simply apply steady pressure to punch holes in up to 20 sheets of #20 paper at once without any misaligned holes or burrs. (Please adjust for different paper thicknesses.) 【Electric Coil Inserter for Labor Saving】The electric coil inserter desigh speeds up coil binding, saving time and effort, especially for large workloads. Its automated binding coil insertion makes the process quick and efficient. You can insert up to 500 sheets using 2-inch diameter coils with the electric coil inserter. 【Adapting to Various Pitch Requirements】The coil binding machine with 46 adjustable disengaging pins offers precise hole punching for any paper size and matches different coil pitches. This feature helps avoid unwanted holes and ensures professional results. It simplifies the binding process, providing flexibility and accurac. Our spiral binding machine includes a starter kit to ensure a professional and long-lasting binding experience. The 8mm (5/16") coils can bind up to 40 sheets of #20 paper, and the kit includes coil crimper pliers for trimming the ends of the coil bindings, as well as front and back covers to provide a sleek and neat finish. This kit includes 100 black 48-loop spiral coils, 50 sheets of 8 mil PVC binding covers, and a pair of coil crimper pliers for precise finishing.