Features: Crafted from premium stainless steel, these 15pcs T bolt screws deliver rustproof, corrosions resistant, and high temperature endurances (700N/mm² tensile strength), ideal for solar panel installation systems and heavy duty industrial applications. Precisions engineered hammers head screws with perfectly flange nut feature burr without threads for effortless installation and vibrations resistant stability in T slot rails and aluminum extrusions. Essential for solar technicians, greenhouse builders, and industrial assemblers requiring reliability fastener for aluminum framing systems, solar mounting rails, and structural framework projects. Optimized for outdoor solar array installations, greenhouse structural reinforcements, and machinery assembly in harsh environments where weather resistant stainless steel fastener are critical. Complete set include T bolts and 10 flange nut for instants deployment across multiple projects, featuring adjustable hammers head design for precise alignment in solar tracking systems and aluminum profile assemblies. Specifications: Color:Two Choices Dimension:7.8mm/0.31in 9.8mm/0.39in Component:stainless steel Package Includes: 15pcs Hammers head screws note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.