multi functional binding machine, Four in one book binding machine. Binding style:Double wire(2:1) Double wire(3:1) Plastic ring Max.BindingThickness:25.4mm/25.4mm/50mm(ellipse)/35mm(round)/25.4mmMax. Punching Ability:28pages /24pages /30pages /20pages Hole distance: 12.7mm/8.47mm/14.3mm/6.35mmHole shape:4x5.5mm/4x4mm/3x8mm/3x6mmHole quantity:27 / 40 / 24 / 53Depth margin: 2.5~6.5mm/2.5~6.5mm/2.5 ...