Yingfeng Screw is a high-grade screw designed and manufactured by Yingfeng Fastening Systems (China) Co. Screws through the surface of the vacuum heat treatment and the surface of the polymer Sgarda coating, it is excellent design, strong self-drilling ability, high corrosion resistance, itself has the function of a drill - it will be drilling and tapping into one, do not need to pre-drill holes, which can greatly reduce the cost of installation labor costs, material costs and project management costs.