A 1/4" Jacob's chuck, is a mechanical device used in various settings, including surgical and medical applications. This chuck is typically used to hold and secure drill bits, reamers, or other rotary tools with a 1/4-inch (6.35 mm) shank diameter. In a surgical setting, a Jacobs Chuck may be attached to a surgical power tool, such as a surgical drill, to perform specific tasks during procedures. The "1/4-inch" designation refers to the chuck's capacity, indicating that it can securely hold tools with a 1/4-inch shank diameter. This size is common for various surgical instruments, including drill bits and reamers.