Self-drilling anchor installs into 3/8"- to 5/8"-thick drywall ceilings and walls without requiring a predrilled hole * Glass-filled nylon body has jaws that open to provide a firm vibration- and shock-resistant hold when a screw is inserted * Made in USA, and works with #6 to #10 size screws (sold separately) * Ultimate tensile strength is 79 lb. in 1/2" drywall with a #8 x 1-1/2" screw * Use one-fourth or less of listed maximum values for safe working loads (as required by local regulations)