(Devarim, Ibid. 25) "Iron and copper are your locks": The land of Asher was the "lock" of Eretz Yisrael (against invaders).
"and as your days" (of fulfilling G-d's will) will be your flow": All of the lands will send their overflow of silver to Eretz Yisrael (to buy their produce), as it is written (Bereshith 47:14) "And Joseph gathered all the silver, etc."
(Ibid. 26) "There is none like the Almighty, Yeshurun": Israel says "There is none like G-d," and the Holy Spirit responds "like the G-d of Yeshurun" (Israel). Israel says (Shemoth 15:11) "Who is like You among the mighty, O L-rd," and the Holy Spirit responds (Devarim 33:29) "Happy are you, O Israel. Who is like you?" Israel says (Ibid. 6:4) "Hear, O Israel, the L-rd our G-d, the L-rd is one," and the Holy Spirit responds (I Chronicles 17:21) "Who is like Your people Israel?" Israel says (Song of Songs 2:3) "As an apple among the trees of the forest, (so is my Beloved"), and the Holy Spirit responds (Ibid. 2) "As a rose among the thorns, (so is My loved one"). Israel says (Shemoth 15:2) "This is my G-d and I will extol Him," and the Holy Spirit responds (Isaiah 43:21) "This people did I fashion for Myself." Israel says (Psalms 89:18) "For You are the splendor of their strength," and the Holy Spirit responds (Isaiah 49:3) "Israel, in whom I glory."