21-Hole Binding Machine Book Binding Machines with 100PCS 3/8'' Comb Bindings Spines for Letter Size, A4, A5 Paper

Instructions
Step 1:Insert the Paper Carefully and Press the Handle to Punch.
Step 2 :Place the Comb Ring and Push the Handle Back to Open the Comb Ring.
Step 3 :Place the Perforated Paper on the Comb Ring and Pull the Handle Back.

Great Value for Money
Our binding machine comes with 100pcs of 3/8'' black PVC comb binding spines（for 50-60 sheets binding capacity）.
Max binding capacity: 450 sheets of paper(with 2'' comb binding spines, not included in package). 

Max punch capacity: 
10-12 sheets of printing paper(paper thickness: 80g(≤20lb) ), 
2 sheets of 230g(≤85lb) cover/textured paper, 
1 sheet of 0.2mm PVC ( if you use paper of other thickness, please reduce the paper according to the actual situation.