Then I said to the angel who talked with me, “What are these, my lord?”: This verse is almost identical with the first part of 1.19. See the comments there. Good News Translation makes it clear that these refers to “these chariots” and many translators will wish to do the same. For my lord, see the comments on 1.9.

Quoted with permission from Clark, David J. & Hatton, Howard A. A Handbook on Zechariah. (UBS Helps for Translators). New York: UBS, 2002. For this and other handbooks for translators see here .