A light tap with a hammer and screwdriver locks clips in place. To remove clips, simply use pliers. Includes 6 clips and 1 removal instruction label per pack. Removal instruction label must be used on the lid of each can shipped. Freund Triple-Grip Can Clips meet US Postal service regulations and are required by UPS for hazardous material shipments. For use w/ 4 oz., 8 oz. (.5 pt), 16 oz. (1pt) , 32 oz. (1 qt) paint cans.