Eastern Maine Shooting Supplies, Inc. EMSS1628 5/16-27 Thread .28 GA. Shotgun aluminum button tip/jag. Made from aluminum, these shotgun button tips are best used with a round cotton cleaning patch. *please note that all of the brass & aluminum supplies are made on site. Sometimes machine setup is involved if our inventory is low. This might lead to a slight delay in shipping time. If that is the case, I will always email you and let you know in case you need to cancel. Thank you for your understanding.