Our products are tested under international standard with professional testing instrument, such like ASTM-F2094/F2094M-18a etcs.We implement the three-inspection system, which includes self-inspection by workers during production and re-inspection by quality inspectors, as well as final product inspection. Our quality testing instruments includes: Digital caliper, Surface roughness and contour measuring instrument,Japan (Mitsutoyo) High precision Roundness measuring instrument,Japan (Mitsutoyo) laser caliper, Metallographic microscope and Density detector.