The solar wood screw in stainless steel is suitable for fastening solar systems or roof hooks above rafter-insulated roofs. It consists of two wooden threads that ensure a spacer screw connection. The counter batten is fixed with the underhead thread and all loads are all loads are transferred directly into the rafter via the thread. The plate head of the screw allows the roof hook to be screwed flush and permanently secure to the timber. The screw has an 8 mm thread with thread lengths of 100 mm (lg) and 60 mm (lg2). Material is stainless steel, surface bright