This lot includes 20 Fastenal 5/16-18 x 1" thread cutting screws with a slotted drive style and hex head. Made of durable steel material, these hex bolts are perfect for a variety of applications in the screw and bolt industry. The system of measurement is in inches, and the brand is Fastenal, a trusted name in the business and industrial sector. These screws are ideal for use in various systems and are sold in a convenient pack of 20. The thread cutting design ensures a clean and precise cut every time, making them a reliable choice for any project. Whether you're in need of fasteners for a construction project or just want to stock up on supplies, this lot of Fastenal screws is an excellent choice.