... Assembling, Welding, Griding, leveling, Sand blasting, PaintingAvailable materials:Carbon Steel & Stainless Steel of GB/DIN/ASTMMaterial of societies ... of paddle & rudder, boring machine for screw shaft hole)Surface treatment:Carbon Steel: Sand blasting, Painting(spray coating) ... :1.Material: bronze, cast iron, stainless steel, carbon steel, alloy steel etc.2.Manufacturing Processes: sand casting ...