Features High Quality: These ball plungers are made of stainless steel, which is durable, can adapt to various indoor and outdoor environments, wear-resistant, rust-proof and anti-corrosion. Configuration: Spring hex socket ball screw socket ball screw (also known as pinball machine, ball plunger, positioning ball screw) is a plunger-shaped component that is compressed by springs, balls and housings through an interference fit. Convenience: Easy to install, easy to use, push the ball with a spring, there is a certain pressure to make the equipment run smoothly. It is an important component to provide pressure and accurate positioning. Uses: hex socket spring ball point grub screws are widely used in some medical equipment, lubrication equipment, pneumatic tools and other products. Inner Hexagon:Screw thread hex socket carbon steel ball spring uniform force, not easy to slip, smooth and complete inside and outside, no burrs. The thread has a tightening effect, the spiral section is smooth, there is no residue, no burr, and the thread is neat and clear. Features: 1.Made of stainless steel material, durable to use. 2.This screw is a load device consisting of a housing, a spring, a ball and a cylinder. 3.Push the ball with a spring with a certain pressure to make the device run smoothly. 4.Widely used in some medical equipment, lubrication equipment, pneumatic tools and other products. Specification: Material: Stainless Steel Optional size: M12*20, M12*25, M12*30, M12*35, M12*40 Quantity: 10pcs Weight: Approx. 95-220 / 3.3-7.8oz  Package list: 10 * Spring Ball Plunger Screws Package List