כִּ֤י ׀ לִוְיַ֤ת חֵ֓ן הֵ֬ם לְרֹאשֶׁ֑ךָ וַ֝עֲנָקִ֗ים לְגַרְגְּרֹתֶֽיךָ׃
For they shall be a chaplet of grace unto thy head, And chains about thy neck.
Rashi on Proverbs
a wreath of grace They are a wreath of grace for your head; i.e., the instruction and the discipline will be a wreath of grace for your head, and they shall be like the rings of a golden ornament.
Rashi on Proverbs
for your neck Heb. לגרגרתיך. Since the trachea is composed of many rings, he refers to the neck in the plural form.