Hillman 4 x 5 in. Shelf Bracket Zinc-Plated reliable strength and durability for mounting shelves securely to walls. Designed with a slightly over 90-degree angle, these brackets provide a stable surface to keep your items stationary. For proper installation, use #7 pan head screws, with 1/2" length screws to fasten the shelf and 1-1/4" screws to attach the bracket to a wood stud, which is sold separately. These shelf brackets must be fastened to a wood stud to ensure stability and safety. They support a safe working load of up to 100 lbs when spaced 32 inches apart, making them suitable for a variety of shelving materials including wood, plastic, or metal. This combination of strength and versatility makes the Hillman zinc-plated shelf brackets an excellent choice for your shelving needs.