Binditek 30 Pack Metal Spiral Binding Coils, 12mm (1/2"), 75 Sheet Capacity, 4:1 Pitch, Black, 48 Loops for Letter Size, for Students and Coworkers

• 【75 Sheet Capacity】These spiral binding coils measure 12mm (1/2") in diameter, can hold up to 75 sheets of #20 paper. They have been proven high-quality through testing reports and are capable of withstanding frequent use.
• 【4:1 Pitch & 48 Loops】Spiral binding coils have a 4:1 pitch, making them compatible with any binding machine that punches 4 holes per inch. (Attention: These 4:1 pitch binding coils are not compatible with the Cinch 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.
• 【30 Per Box】A box of 30 spiral binding coils made from high-quality metal material, it offers elasticity and durability for long-lasting use, ensuring professional and secure binding for all of your binding projects. Ideal for engineering files, business projects, office documents, and university presentations, they serve as excellent gifts suitable for teachers, students, and coworkers.

5 Colors For Maximum Efficiency: There are 5 colors of plastic binding coils in this set, each color for 10pcs, include Red, Blue, Yellow, Green, Pink, Organize different types of files by color-coding for quick and easy identification.