Yea Jann Industrial Co., Ltd. has always devoted to renovation and improvement. With many years of experiences and research, we have developed True Stain® 300 Series and registered the patent rights all around the world. True Stain® series has raised the standard of stainless steel fasteners. True Stain® 300 Series stainless steel fasteners provide the best anti-shear, torsional and tensile strength. True-Stain 300 Series qualifies DIN 10.9 Grade safety strength requirement, and could also be non-magnetic without additional heat treatment. The superior strength is compatible to alloy steel. The prevalence of True Stain® 300 series fasteners could widely apply onto metal and hardwood construction, automobiles and electronic devices.