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FIX-T4-20 is a self-tapping, double layer, corrosion resistant nut and bolt system designed for medium duty applications. Its simple four-step installation process makes projects easier and more efficient. The system uses four distinct self-tapping components: a thread forming screw, a locking washer, a stainless steel washer, and an optional two-piece locking nut. The FIX-T4-20 system does not require any additional tools to install. This unique design makes assembling and disassembling a breeze. With its signature drainage holes, the FIX-T4-20 offers superior corrosion resistance and is ideal for indoor/outdoor applications that are exposed to moisture and extreme temperatures. It is great for automotive, RV, industrial, and marine applications.