three boxes of The Flat Head Structural Wood Screws HeadLOK 3/8 in x 4-1/2 in 50-Pack by FastenMaster are high-quality steel screws designed for wood construction. With a flat head style and a length of 4-1/2 inches, these screws offer reliable holding power for various building projects. The pack of 50 ensures that you have an ample supply for your job, making them a convenient and durable choice for fastening wood materials in a professional setting.