We are professionally producing Precision parts in China, ISO9001 certified. We have the automatic CNC lathe and professional engineer to make our good precision parts. 1. All the precision parts: 1): Length: <4"(100mm); 2): Diameter: <0.8"(20mm); 3): Torerance: ±0.0004"(0.01mm); If any parts is within this scape, that's our business, we can make it with aluminum, brass, steel, etc; 2. We do not offer any read-made parts, we are making the custom precision parts as your drawings or the samples, pls confirm; We welcome small quantities