... Gear, Worm, Worm Shaft, Casting, Sand-Casting 1) Ductile iron and gray iron sand casting Features:Gearbox, Gear case, Gear, Worm, Worm Shaft, ... Casting, Sand-Casting1) Ductile iron and gray iron sand casting gearbox2) Reducer ... Parts Product Line Gearbox 1,000 Pieces / Month, Gear & Worm Gear 4,000 Pieces / Month, Valve 800 Pieces / Month, ...