Precisely engineered hammer heads screws pair seamlessly with 8mm flange nut, featuring smooth threads and burr without surfaces for effortless installation and rock connection Ideal for solar panel installers, greenhouse builders, and industrial contractors requiring stable fasteners for structural framework and heavy equipment assembly Crafted from premium 70 stainless steel, these 15pcs M8x20 T bolt screws deliver 700N / mm² tensile strength for rustproof, erosion resistant in extreme temperatures The hammer heads designs enables precise alignment adjustments in components, while alloy construction ensures lasting durability across repetitive installations for securing photovoltaic aluminum profile, solar mounting rails, and T slot track systems in outdoor solar farms or indoor mechanical workshops, Manufacturer: JDNH