The UNIRAC 003251W self-drill screw features a #14 thread size and 3-inch length, specifically engineered for secure attachment to roofing substrates in solar mounting applications. Made of high-strength stainless steel, the screw delivers excellent corrosion resistance and long-term durability in outdoor environments. Its self-drilling tip allows it to pierce metal or composite roof materials without pre-drilling, which helps streamline installation and reduce labor time.