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Bevel helical gearboxes O, with a robust and single piece housing and three reduction stages. This range of products is extremely robust due to the single piece, cast housing, which, combined with the technical choice to have 3 reduction stages, and places the product at the high-end of the market in terms of quality and performance. STMspa is Italian based company that design and supply all kind of gearboxes and gear motors. STMspa supply their application worldwide.