Why do they beautify them with gold and silver?
Radak: It is wood; they cover it with gold and silver so it will be nice in the eyes of those who see it, and it will enter their hearts to serve it.
What are "Masmeros"?
Rashi: They are nails.
What are "Makavos"?
Rashi: They are hammers.
What is the meaning of "Yechazekum"?
Radak: They fasten the plates of gold and silver to the idols via nails and hammers. They beat them until Lo Yafik, i.e. it will not be detached or fall, like u'Fik Birkayim. Malbim - the images themselves are not gold and silver, merely gold and silver are attached to them.
What is the meaning of "v'Lo Yafik"?
Rashi: It does not bend (bow from) the knees, like "l'Fukah" (Shmuel I, 25:31) and "u'Fik Birkayim" (Nachum 2:11).
Radak #1: It will not be detached or fall, like "u'Fik Birkayim" (Nachum 2:11).
Radak #2: This is like "v'Safek la'Ra'av" (Yeshayah 58:10); it is Po'el Omed (the action applies only to the subject); it does not leave its place.
