These handy little gadgets can be used to open the cans, and to seal it back up again. Ideal if you only want to drink half a can, and effective in stopping dust dirt and bugs into cans. These canned drink savers fit it any standard aluminum cans of 6oz, 8oz, 12oz, or 16oz. Perfect for picnics, garden barbecues, camping, cookouts, or family friends gathering. Small and portable to carry.Easy to use: Just slip it onto the tab until it locks, lift up to open the can, then swivel it to cover the mouth opening. The whole thing takes less than 2 seconds!