Features This screw is a load device consisting of a housing, a spring, a ball and a cylinder Made of stainless steel material, durable to use 100% brand new and high quality Push the ball with a spring with a certain pressure to make the device run smoothly Widely used in some equipment, lubrication equipment, pneumatic tools and other products S pecification: 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    Features: 100% brand new and high quality. Made of stainless steel material, durable to use. This screw is a load device consisting of a housing, a spring, a ball and a cylinder. Push the ball with a spring with a certain pressure to make the device run smoothly. Widely used in some ubrication equipment, pneumatic tools and other products. Package list: 10 * Spring Ball Plunger Screws Package List