***** Best Quality Guranteed. *****Premium quality UL Listed cable ties manufactured from industrial strength nylon for long lasting product performance; duct straps UL 181B-C Listed Plenum Rated HVAC *****Bundle diameter 14.37 inch (365mm); operating temp minus 40 degrees fahrenheit to 185 degrees fahrenheit *****48 inch 175 pound duct straps have been investigated to ANSI/UL 181B and have also been tested to UL 2043, "fire test for heat and visible smoke release for discrete products and their accessories installed in air-handling spaces; " These products have been found to be suitable for use in plenums in accordance with the "International Mechanical Code" "Uniform Mechanical Code" and ANSI/NFPA 90; 50 pieces contractor size packaging; recommended for indoor use *****Perfect for organizing a home office or a project around the house; doing small home renovations or a commercial construction job; merchandising product hanging signs and banners craft sports or seasonal holid