The Heco-Topix-T Solar 8x240 ensures a long-lasting and economical mounting of solar brackets on over-rafter-insulated roofs. They guarantee a fixation at defined intervals, where the secondary thread fixes the counter batten and all the loads are transmitted via the thread directly into the rafters. The screw is quick and easy to use without predrilling thanks to the topix tip. The tip also prevents any risk of the counter batten splitting; meaning installation is quick and clean. Material: stainless steel A2, coated