Spiral Binder
The accessories with two kind of pitches can be choosed, 3:1 and 4:1. The material of Accessories is PVC or metal wire, there are variety of sizes (6.4mm-50.8mm), can bind larger documents. PVC is more durable, because of it flexes and also doesn't have sharp ends like metal coils.
PD-1501
Spiral Binder PD-2000
Spiral Binder EP-20