Binding Machine punches up to 12 sheets (80gsm 20lb paper) at the time and binds up to 120 sheets with a 3:1 pitch double loop wire or spiral binding coil, which means there are three holes per inch of your book's spine. Max. binding ring size: 0.56 In wire-o ring or non-limited spiral binding coil. This machine is used on, professional finish to presentations, reference documents, proposals, notebook, and more with our binding machine. Note: This binding machine comes with oiled cutting blade for protecting the punch die away from rusting. To avoid staining on the important document, please use oiled removing paper(enclosed) to punch first in order to clean up the blades. Feature: All steel structure both inside and outside; Manual, no electricity required; Advanced carbide blades, powerful punch structure; Solid round steel handle, the best effort lever; Vertical pressure system, close coil completely Both punching and binding function Parameter: Binding capacity: 120 Pages /20Lb(80g) Paper Punching capacity: 12 Pages/20Lb(80g) Punching hole size: square:4x4mm Punching hole quality: 3:1; Pitch Size: 3mm, 5mm, 7mm Max Punch Binding Size: 12"(297mm) Ring Selection Adjust this knob, machine could binding more size wire coil. Solid base With rubber foot-pad, quiet and firm. Waste Bin Waste drawer for keeping paper scrap Iron handle Long power-saving handle Note: Our punching binding machine has three pitch sizes(3mm, 5mm, 7mm). If needed you could buy these three sizes coils.