Rayson 22.2mm Spiral Binding Coil 7/8" Black Coil bindings Spines 4:1 Pitch 50/Box, SBR41222-50B

Product description <img alt="rayson coil binding spines" src="https://m.media-amazon.com/images/S/aplus-media-library-service-media/718bee14-763e-43f2-9d8f-44af0dea6e96.__CR0,0,600,450_PT0_SX600_V1___.jpg"> <img alt="What-is-the-difference-between-3-to-1-and-4-to-1-pitch" src="https://m.media-amazon.com/images/S/aplus-media-library-service-media/e573ba0d-84bc-46d9-b41b-d8c3e9223215.__CR0,0,650,350_PT0_SX650_V1___.jpg"> What is the Difference Between 3:1 and 4:1 Pitch? 3:1 Pitch coil binding ring means per inch has 3 holes4:1 Pitch coil binding ring means per inch has 4 holesThis is very important distinguish 3:1 from 4:1 cause the things to be as different.

4:1 means per inch has 4 holes.

They are used with different binding machine.