Function: the ledger blade is inserted on the bottom cup of the standard and is fixed by the top cup so that it make the whole system strong and the steel plank is put on the ledger.

Specification:48.3mm out diameter * 3.0mm thick steel

Common size:1.3m 1.8m,2.5m,3.0m

Other size:0.6m,0.74m,0.9m,1.0m,1.2m