Great Value for Money Our binding machine comes with 100pcs of 3/8" black 21-ring PVC comb bindings in the package. Max binding capacity: 450 sheets (with 2" comb plastic bindings). Max punch capacity: 10-12 sheets (Paper Thickness: 80g (20lb) paper). Note: If you use paper of other thickness, please reduce the paper according to the actual situation. Humanized Design, Light but Sturdy Durable metal construction for long-lasting use. Tips: This binding machine comes with an 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. Easy and Safe to Use Manual punching and binding operation only need 2 steps. Low force handle simplifies punching. Sturdy metal construction, non-slip feet, and easy to use. Tips: First of all, please install the handle 90 degrees perpendicular to the tray; otherwise, there is no way to activate the punch function. Marks of A4/A5/Letter Size & Adjustable Edge Guide This upgraded comb binding machine is suitable for Letter Size (19 holes), A4 Size (21 holes), A5 Size (15 holes). Enhanced accuracy edge guide from 3mm to 5mm for pinpoint punching. Adjustments can be made with ease. Strict Quality Control Every batch of our binding machine has been tested before packing. Our friendly and reliable customer service team will respond to you within 24 hours. You can purchase our products with full confidence.