Figure 3.
Rings with different rolling reductions: (a) blank, (b) rolled ring 1, (c) rolled ring 2, (d) rolled ring 3.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.