This American customer is the manufacturer of air compressor. They came to China in 2012 to find supplier of air compressor crankshaft. They contacted several crankshaft manufacturers and raised their requirements. All the suppliers provided crankshaft samples according to their requirements. After taking the samples on trials, they chose Nazhen. Finally, they ordered air compressor crankshaft of over 20 different specifications from Nazhen and signed long-term agreement with us.