A Jacobs Chuck is a type of drill chuck commonly used in hand drills and power tools. It allows for the quick and easy attachment and removal of drill bits. The design typically features a three-jaw mechanism that grips the bit securely, ensuring precise drilling. Invented by the Jacobs Manufacturing Company, the Jacobs Chuck is known for its reliability and versatility. It can accommodate various sizes of drill bits, making it a popular choice among both professionals and DIY enthusiasts. The chuck is often tightened or loosened by hand or with a key, depending on the model.