The 8 Drill Chuck Key Assortment by Jacobs includes various sizes such as #4, 3, and 32 Series K7 #TKG. These keyed chuck keys are designed for use with drill chucks, providing a secure and reliable hold for your drills. With high-quality construction and a range of sizes included, this assortment is perfect for professionals in CNC, metalworking, and manufacturing industries. Upgrade your workholding and toolholding capabilities with this essential set of drill chuck keys.