X1Tools/Tarps 12 Mil is a Heavy Duty Clear & Translucent r poly tarps are perfect for situations where you want light to penetrate through the tarp or to see what is under it. Widely used for renovations, boat covers, roofing, construction and horticulture. Rust proof aluminum grommets spaced every 18". This tough tarp has reinforced corners, rope-reinforced edges and is waterproof and rotproof while providing 100 percent UV protection ready to handle the tough weather.