Allen Type Ball Plunger is a type of spring-loaded used to apply pressure or lock objects in place. It consists of a ball bearing enclosed in a cylindrical body with a threaded hole on one. The ball bearing is held in place by a spring, which allows it to move up and down within the body. When the plunger is depressed, the ball bearing is pushed out of the threaded hole, allowing it to apply pressure or hold objects in place. The Allen type refers to the shape of the hexagonal socket on the top of the plunger, which allows it to be easily adjusted using an Allen wrench. Allen Type Ball Plunger is commonly used in a range of applications, including fixtures, jigs, and machine tooling.