6MM 3:1 Black 12" Coil Spiral Binding (100pc box)
3:1 pitch (3 holes per 1") spiral binding / coil is less common. Designed for use with the hole pattern used in Wire Binding (twin loop, double loop) or with GBC Proclick. 3:1 pitch spiral coil is easier to use for large diameter books because there are less holes / punch patterns to run the spiral / coil through. Spiral binding elements for this hole pattern are available in sizes ranging from 6mm up to 50mm.
