Plastic binding Coil 4:1 # 20 (A4) white 50/1

Plastic binding coil 4:1 (6,35mm)

Plastic coil are virtually indestructible.
360 degree page turn allowing document to be opened completely flat or folded back on itself.
Note: The pages go out of registration when turned (left hand side will drop lower than the right).
Spiral (metal) is used mainly for notebook production.