1.Large punch capacity
2.Large waste bin 
3.Adjustable paper margin
4.Overall metal covers, die-casting base
5.With mechanism to check the thickness of paper
6.24 release pins

Details:
Max. binding capacity: 450sheets /51mm Rings
Max. Punching capacity: 22 sheets(70gsm)
Holes: 24 holes
Paper margin: 2.5/3.5/4.5/5.5mm 
Distance between holes: 14.3mm
Hole size: 3x8mm