ThruFlow™ panels are UV resistant and therefore keep your deck looking new for many more years than other building materials. ThruFlow™ is resistant to rot and insects and absolutely no treating is required. ThruFlow™ panels come in a variety of colours to suit the look of your home and stay cool to the touch even in the hot summer sun. The No-Maintenance aspect will surely have you enjoying your deck rather than working on your deck. 2.5″ #10 – 305 Stainless #2 Square Drive Pan-head fasteners are required to properly install ThruFlow™ panels, and are sold here in packs of 100pcs.