The case neck is the portion of the case that extends from the case shoulder to the mouth and is the portion of the case that also keeps the bullet in place, this is called case neck tension. Not all cases have a neck, for example straight wall pistol cases do not have a definitive neck area.
Are you aware that Google is offering +1 to Everyone? Share your +1 with Every One of Your Friends by looking for the +1 on websites everywhere!"