This 75-piece pack of TAPCON 24340 concrete screw anchors is a great addition to any tool collection. These screws have a hex washer head and are 1/4 inch in diameter and 4 inches long. They are made of steel and come with a hex key drive style. The screws are specifically designed for use in concrete and have a number of different applications in construction and industrial settings. Whether you're installing shelving, securing machinery, or building a new structure, these TAPCON screws are a reliable and sturdy choice. With their high-quality construction and practical design, these screws are a must-have for any DIY enthusiast or professional contractor.