TOGGLER SNAPTOGGLE BC Toggle Anchor, Zinc-Plated Steel Channel, Made in US, 3/8" to 2-1/2" Grip Range, For 3/8"-16 UNC Fastener Size (Pack of 25) Toggle anchor installs behind 3/8"- to 2-1/2"-thick hollow materials including gypsum board, drywall, and concrete block to provide a secure hold from within the mounting material Anchor affixes to the wall before adding the bolt and fixture, allowing one-person installation and fixture changes Made in USA, and works with 3/8"-16 UNC-threaded metal bolts (sold separately) Ultimate tensile strength is 275 lb. in 1/2" drywall and 1,745 lb. in concrete block with a 3/8"-16 UNC bolt Use one-fourth or less of listed maximum values for safe working loads (as required by local regulations)