美国采购需求：标志杆，方形交通杆，1-8号标志杆

I'm looking for information on hot dip galvanized square breakaway sign posts. Specifically, I need posts with 7/16" holes punched on 1" centers along all four sides. I require two different widths: one batch of 500 posts at 2" and another batch of 500 posts at 1.75", all in 14 gauge and 47" in length. Could you please provide pricing for these? Additionally, can you confirm if these can telescope together? Thanks!