1/2 Glue glue sticks (or 12 mm) are the most common size of formed hot melt and they may also be referred to as 7/16". Gluegun.com carries a huge selection of 1/2" glue sticks from all of the major hot melt manufacturers. Use the tools on the left to narrow your search by Manufacturer, bond type and more. If you are feeling overwhelmed, you can always contact one of our glue experts to discuss the best glue stick for bonding the materials in your application. You can also visit our craft glue stick section for lower volume or specialty projects.