These deck railing brackets are made of reinforced Nylon 6/6 with 20% sun-proof fiberglass, featuring high hardness, crack resistance, and corrosion resistance for indoor and outdoor use. The brackets fit 2 in.×4 in. (actual size 1-1/2 in.×3-1/2 in.) wooden posts, each equipped with 3 back holes and 4 side holes to ensure secure and stable railing connections. Note: Suitable for dry wood; wet wood should be dried or sanded before use. These deck railing brackets are made of reinforced Nylon 6/6 with 20% sun-proof fiberglass, featuring high hardness, crack resistance, and corrosion resistance for indoor and outdoor use. The brackets fit 2 in.×4 in. (actual size 1-1/2 in.×3-1/2 in.) wooden posts, each equipped with 3 back holes and 4 side holes to ensure secure and stable railing connections. Note: Suitable for dry wood; wet wood should be dried or sanded before use. The package includes 30 deck rail brackets, 210 galvanized black screws, and a drill bit. Material: Plastic.