Use a number 8 or 10 screw to mount to a variety of surfaces, wood, sheet metal and concrete. Use around the home, vehicles, shop or work. KT screw mount cable ties are made from strong DuPont 6/6 nylon material. This material yields a higher break points even at colder temperatures then the competition. Packaged in resealable bags to help preserve moisture and keeps ties organized. Higher moisture gives most zip ties more tensile strength. UL listed. U/V ties can be used outdoors and indoors.