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21 holes plastic spring binder
Rectangular hole: 3x8mm
Manual binding system
Number of punched paper: 20 sheets of A4 (70gms)/time
The maximum number of papers attached to the spring: 500 sheets
Alignment and back adjustment function
Punching function: 2 holes 20 & 21
Spring: 11 kg
Dimensions: 430x280x240 mm
