1Made of stainless steel, high hardness, high strength, wear-resisting and long service life. 2The motion of the ball is driven by a spring of certain pressure, which makes the equipment run smoothly. 3Good positioning tools and jigs, can holds the plunger body securely in place. 4It is often used in die, fixture, assembly and other work 5Widely used in some medical equipment, lubrication equipment, pneumatic tools and other products.