This structure is the main horizontal element or Scaffold. Here is how it looks like;
They Have forged blade ends to be located in cup joints on the verticals.
Horizontal lengths, in the table, are center-to-center distances between two verticals.
Piece weights are calculated for pipes or 48,3/3.25 mm. For light duty works, thinner tubular alternatives can be prefered in order to reduce the preinvestment costs.