Answer:

LBARS

Answer	Crossword Clue
LBARS	Angle irons
LBARS	Construction pieces
LBARS	Angle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers

LBARS	Right-angled supports
LBARS	Letter-shaped supports
LBARS	Angle irons.
LBARS	Structural beams
LBARS	Some construction beams
LBARS	Steel braces with right-angle bends
LBARS	Bent beams
LBARS	Construction beams with 90-degree angles

LBARS	Shelf supports