Full Aperture Easy Open End is suitable for sterilization, and can be used for packaging canned foods such as fish, meat, fruit, vegetables, etc. A Screw Caps is a mechanical device which is screwed on and off of a "finish" on a container. Either continuous threads or lugs are used. It must be engineered to be cost-effective, to provide an effective seal (and barrier), to be compatible with the contents, to be easily opened by the consumer, often to be reclosable, and to comply with product, package, and environmental laws and regulations. http://www.eoebright.com/full-aperture-easy-open-end/