These Hex Key Head Bolts are a great addition to your hardware collection. They come in a pack of 50 and have a screw size of #1. The thread size is #24 with a 3/8-24 x 1 model. The head style is a hex head and the drive style is a hex-key. These bolts are perfect for industrial and business use, and are measured in inches. Add these bolts to your collection for your next project!