"Hole Punch lets you easily punch a 1/5 inch hole through thin and thick paper, chipboard like, book board, thin tin, fabric, leather and more.^ ADJUSTABLE-Set the guide as deep or shallow as you want and consistently punch a line of holes.^ Eyelet Hole Puncher: the portable tool is made of metal, durable and not easy to rust; Necessary and good tool for school, home and office.^ Convenient and easy to use: easy to take and hold, smooth surface and good shape design, MOST IMPORTANCE IS IT CAN PUNCH 30 A4 PAPERS FOR EACH TIME ^ Ideal for any kind of paper, chipboard, thin metal, craft paper, art project or other materials. Note:After a short term use, the cap install part of punch need to be twisted tight again, or it will effect the whole function; You can also add some oil to joint part to reduce the strength when using it."