This spool belongs to series which is normed from German rule "DIN 46399". This particular reel is used in a lot of different markets; for example it's used to wind on steel wire, tin wire, fish filament, spark-erosion (EDM) wire, enamelled copper wire, gold wire, precious chains.
Realized in two pieces, the cap is fixed to the body with a joint which means that use of glues is pointless. This joint assures also a perfect axiality of centering holes. The particular straight ribbing guarantee great flange resistance.
Usually produced in ABS, High Impact Polystyrene (PS) or polypropylene (PP) .