Hot glue guns must be matched to the correct hot glue stick size to function properly. Here are the most common hot glue stick sizes. If you need more information, check our our in-depth guide to choosing the right hot glue stick size.  Most Common Hot Glue Stick Sizes 5/16" Hot Glue Sticks - also called 7mm or "mini glue sticks" 1/2" Hot Glue Sticks - also called 11mm or 12mm  5/8" Hot Glue Sticks - also called 15mm 1" Hot Glue Sticks - also called PG glue sticks 1.75" Hot Glue Slugs - also called 43mm glue slugs