... quality & low price. 2. OEM service metal spare parts, Our investment casting process:1) Enhancing casting parts dimensional accuracy, decreasing the surface roughness, minimizing ... grades.2) Producing thin wall thickness, Small and lightweight parts, and parts with fine pattern,letters, grooves or curve holes.3) ... /2°.Castings Surface Roughness: Ra3.2~Ra12.5Small orders accepted metal spare parts