Coil Spiral Binding Machine Manual Book Maker 21-Holes Binding 380 Sheets Punch Binder With Adjustable Coil Binding Spines ,Easy to Operate

[Binding consumables] rubber ring clamp [Margin adjustment]2.5/4.5/6.5mm [Punch thickness]20 pages (80g) [Hole size]3mm x 8mm rectangle [Binding thickness]380 pages (80g)