Shelf-Maid T-LOC system uses a double-headed lag bolt that slots into the brackets for adjustability and strength. Brackets and arms are crafted for maximum strength and durability, up to 225 lb. per bracket. The company offers mounting products for wood studs, steel studs, concrete, and drywall. All brackets have an embedded poly block that allows for the shelf to be attached via trim screws or nails but can be repositioned. These allow a user to install a floating shelf that remains stable but is still adjustable even after installation.