TOGGLER SNAPTOGGLE BB Toggle Anchor, Zinc-Plated Steel Channel, Made in US, 3/8" to 3-5/8" Grip Range, For 1/4"-20 UNC Fastener Size (Pack of 100) Toggle anchor installs behind 3/8"- to 3-5/8"-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 1/4"-20 UNC-threaded metal bolts (sold separately) Ultimate tensile strength is 265 lb. in 1/2" drywall and 1,080 lb. in concrete block with a 1/4"-20 UNC bolt Use one-fourth or less of listed maximum values for safe working loads (as required by local regulations)