The 20 PACK K2 Everest Solar Panel Roof Rack T-Bolts are high-quality stainless steel bolts designed for secure mounting of solar panels on rooftops. With a 20% panel conversion efficiency, these T-Bolts are corrosion-resistant and suitable for both indoor and outdoor use. The M10 X 20mm T-Bolt model from the K2 brand ensures durability and reliability in extreme weather conditions. These T-Bolts come with nuts included and are ideal for solar panel racking hardware applications, providing a secure and efficient solution for harnessing alternative energy sources.