These paper clamps are different from common file clips, which are much more sturdy, durable and anti-loose. Simply push the clamps folder, and you can easily bind almost 40 sheets A4 papers, files, test papers at a time. No scratches. No damage binding. Sliding and pushing binding. Firmly paper clamp and easy to remove. Widely used in office, school, home, etc. Clamp pusher is equiped with a flexible anti-rust spring, which can hold 8 clamps at a time. Clips can be removed and reused time and time again without damaging paper. Perfect for personalizing, coding and indexing paperwork, etc.