The TAPCON 11420 1/2" x 4" Steel Hex Washer-Head Concrete Anchors come in a pack of 10 and are designed for both indoor and outdoor use. With a diameter of 4 inches and a length of 12 inches, these anchors provide a secure hold for various fastening needs. The hex shape and washer-head design ensure a reliable grip in concrete and other materials, making them a versatile and durable fastening solution for various industrial and commercial applications. Trust the Tapcon brand for quality and performance in your fastening projects.