This spool belongs to series which is normed from German rule "DIN 8559". Studied to wind on welding wire and used in a lot of markets, like:
gold wire, 3d printing filament, cables, extruded profiles, seals, tapes, copper wire, stainless steel wire, aluminium wire,.
Spool capacity is about 15 kg. metallic wire or about 2,5 kg. plastic filament.
Reel made in one piece.
Spool usually produced in high impact polystyrene (PS) and polypropylene (PP).