This is the third KATT portable ladder support bracket I have purchased from Absafe. The other two were for wall fixing, whereas this one is for roof edge fixing. It is made of aluminium plate to be compatible with Zincalume roof sheeting. I have had it powder coated to match the roof sheeting and for added corrosion protection. Superb design and quality at a reasonable price from Absafe. Ordered online. It arrived in no time, well packaged, complete with Allen key! Thanks to Absafe. Robert, Charlestown NSW