For fastening applications in concrete. Contractor grade anchors. Internally threaded. Some common applications are overhead applications, transformer sandmeters, ceiling fans, and electrical light fixtures. Anchors approvals/listings: ICC/ICBO Evalustion Service Inc. #ER 1372, City of Los Angeles R.R. 2748, Underwriters Laboratories, Factory mutual, Meets or exceeds U.S. Government G.S.A. specification: FF S 325 Group VIII, Type 1, Class 1, California State Fire Marshall, Caltrans. Single count poly packaging. 3/8", 1 piece.