Hi, I just laid in a stash of brads myself!
It's frustrating that the sizes are rarely noted. I am always on the lookout for "not mini". These chunky brads are 10mm. I recently purchased (from Scrapbook.com) We R Memory Keepers-Brad Basics in every color they carry. There are 54 brads per set, and the sizes are 4.7mm, 10mm, and 15mm. They are currently on sale for $2.54. I love them!
I (think) that when a size IS stated, it refers to the diameter.
Hope this helps.