Designed to be used in a 1/4" hole. Can be used on sheet-metal up to 1/4" thick. KT medium duty 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. Length is approximate. | K-T Industries Fir Tree Push Mount Zip Ties in Black | Size 8"