As a YS division, all JCF products are tested and retested according toYS standards to meet rigorous performance standards.JCF is a professional construction fastener manufacturer of quality products, for this reason, JCF always offer more than your expectation.For this market, quality is everything. Products must be 100% reliable and durable to meet the demand. JCF attach great importance to quality and correspond with clients demands, include inspection standard, torsional strength, case hardness, case depth, core hardness, curved test, salt spray test, penetration test, electroplating. . . . . Now, JCF construction screws are guaranteed to meet or exceed the quality of all other brands, for us, solve clients's problem and offer more are our job and have to do it. JCF offers a wide assortment of the highest quality fasteners and most fasteners are available in various sizes to help you find the right fastener for your project, all products must meet this high standard of excellence and we let you take all the credit. If you have any question, pls let me know and kindly give me a message.