5x Aliminium Special Purpose Edging Lengths

Skylarc Ref B173485

5x Aliminium Special Purpose Edging Lengths.
We are unsure as to what these lengths are specifically for, see photos for design/type details.
Four are full lengths of 2750mm plus a fifth cut length at 1670mm long.
All have side widths of 90x70mm.
Dirty surfaces from Workshop storage.