Buy Binditek 100 Pack Plastic Spiral Binding Coils, 12mm(1/2"),90 Sheet Capacity,4 The binding spines lie flat, with 360 degree rotation for easy insertion and removal of paper sheets. 【Wide Applicable】Plastic spirals for binding are used in engineering files, business projects, office documents, university presentations. The spiral coils have a 4:1 pitch to fit any binding machine that punches 4 holes per inch. Coil Size Chart Printable SWZHAI Plastic Spiral Binding Coils 100 Pack, Coil Binding 4:1 Pitch Coil Binding Supplies Black Plastc Spral Bndng Cols 5/16 - DY Statonery They serve as excellent gifts suitable for teachers, students, and co-workers. 【Enough to Meet Your Needs】this package consists of 100 pieces of plastic spiral binding coils in 4 different sizes, rich quantity can suffice your daily needs. 100 Pack 6mm Plastic Spiral Binding Coils - 30 Sheet 【Buy with Confidence】Coil binding spines can help you organise messy documents, keep them tidy and in order, and help keep your desk tidy.