Just slip the metal prongs into the top of the book (as shown) to show the page you want to keep open. And it will stay open. If there is a page you want to turn, avoid clipping that page so you can flip that page. So simple. The original, the best on the market! Avoid those cheap, flimsy copies that never work right. This is the original, USA made, Page Clip and it's made of rigid, 18 gauge, nickel-plated, tempered, aircraft steel. Guaranteed not to bend under normal use! It measures 2" x 4" and slips easily in the top of any book, no matter how large or how thick it is. If there is a page to flip, just avoid clipping that page. Works great on text books and cook books too.