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.
Comparison of Group D (no stem, depicted in blue, measuring points #1-#5) vs. Group C (long press-fit stem, depicted in red, measuring points #1-#9).
