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Starter units consist of four standard angle posts, *two left-to-right standard double rivet angle/channel beams per level and two front-to-back standard double rivet angle beams per level.
Adder units consist of two standard T-Posts, *two left-to-right standard double rivet angle/channel beams per level and two front-to-back standard double rivet angle beams per level. *Channel beam units are provided with left-to-right double rivet angle beams at bottom level.