Akiles DuoMac-541 heavy Duty 2-in-1 Punching & Binding Machine for: 5:1 Pitch Plastic Binding Coils & 4:1 Pitch Plastic Binding Coils. With two independent punching die sets, this versatile & easy to use combo binder allows you to punch & bind multiple systems or different pitches. Has Separate Punch handles & Punch Throat & Ruler. Depth Margin Control: Provides the correct punch margin depth for each coil size. Maximizes document tear resistance. Open Punching Throat & Continuous Punching Guide: For an easy alignment & punching of longer documents. Diameter Scale: Measures documents thickness in order to select best coil size option. Has Waste Drawer & Side Margin Control: Provides and evenly Centered punch for all document sizes