Heavy Duty Steel Construction: Made from premium stainless steel, these matte black brackets strength, stability, and long lasting durability The robust structure safely supports heavy loads, making excellent for stair handrails and floating shelves, while the finish prevents rust and erosion Quick & Easy Installation: Designed for easy setup with pre drilled holes and all necessary screws, anchors, and tools Achieve secure mounting on wood, wallboard, concrete, or stone wall in minutes—no additional hardware required Pre drilled holes secure alignment for stable installation Versatile Indoor Applications: Ideal for various indoor uses, including stair handrails, hallway rails, and garage storage racks 270° Adjustable Rotation Design: These black square tube brackets feature a 270 degree adjustable rotation function, enabling multi angles installation for any stair incline or wall mounted shelves Complete Installation Hardware set: This all inclusive package includes every component needed for professional setup: 4 brackets, long screws, short screws, wall anchors, keys, and open end wrenches, Manufacturer: NMFLAB