Package--There have 4 pieces 40mm metal square bracket and 16 pieces screws in the package. It is suitable for bedroom bed and common bed in home. Galvanized Surface--Bed frame brackets' colored surface is treated with a galvanizing process to make it stronger, anti-corrosion and hard to rust. And polished smooth with no burrs, which will not scratch your fingers. 90 Degree Angle--Wood bed rail fasteners' shape is rectangular with a 90-degree angle between the two vertical surfaces, which can fix the rectangular wood rails well and make it difficult to translocate. Easy to Install--After determining the installation location, fix it with screws, and pay attention to its opening facing upwards to ensure a more stable installation. Wide Application--Heavy Duty bed hinges can be used for the installation of home furniture and the support and fixation of bed beams and shelves.