The b2086sl is an 8 oz silver aluminum metal bullet round bottle with 24-410 neck finish. The cosmo round, also called bullet round and imperial round, is characterized by its tall and slender build with steeply rounded shoulders. This item has a 24-410 neck finish. The first number refers to the diameter (in mm), and the second refers to the closure depth, style and thread. This container can be paired with a closure with a matching finish.