These are a handy item to clean up various plumbing projects. Sold in sets of 2. 

6AN:   Inside  Diameter: 3/8in/10mm

8AN:   Inside Diameter: 1/2in/13mm

10AN: Inside Diameter: 5/8in/16mm

They are best sized for braided -an lines. Meaning they won’t quite be tight on a hard line that is o.d. sized without an insulator of some type. The largest diameter works great for our hydroboost kit.