STAINLESS STEEL CLIPS: These packaging clips are made of polished stainless steel, very robust without breaking, durable, unlike plastic. Smooth surface, safe to use. LONGER GRIPPING SURFACE FOR VARIOUS TYPES OF BAGS: The serrated part of the bag sealing clips is approximately 6.7 cm wide and can grip small, medium, or large bags. Large sizes are no problem. We used an alligator tooth closing style to achieve a near-perfect seal, gripping your food packages very tightly. CONVENIENT TO USE: With a comfortable handle, not complicated to use, it may require some force to open as it is very strong. Just one open and close, the metal clip bites tightly into the packaging. Lots of unfinished foods and snacks need the clips to close, everything you need to keep fresh. No more stale chips or crackers and no more wasted freezer bags. These clips can also be used to clip office paper, photos, or clothes. You can combine them with magnets, adhesive pads, and other adhesive materials for even more uses.