... cylinder, hydraulic clipper cylinder, etc.3) For the Quality Inspection System, tthrough our own efforts, we have ... We adopt 2-2.5%IIAQL system for quality inspection and 100% for hydraulic testing before shipment is ensured. ... China 45# Steel, 27SiMn and the raw material for rod is 45#steel, 42CrMo, 40Cr, and ... we have 1 year of guarantee for our product.5) Due to our good quality, ...