For fastening applications in concrete. Contractor grade anchors. Internally threaded. Some common applications are overhead applications, transformers and meters, 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.