Features: Made of stainless steel material, which can provides strength and offers good corrosion resistance in many circumstances. Positioning ball is also called ball head plunger or spring plunger. A load device (SLDs) consisting of a shell, spring, ball or cylinder. Widely used in some medical equipment, lubrication equipment, pneumatic tools and other products. Engineers often use it in mold, fixture, assembly and other work. With the help of a certain pressure of the spring to promote the movement of the ball, so that the smooth operation of the equipment. Specification: Material: stainless steel Size:M6*8/10/12/16/20/25(Optional) Weight: Approx.20g~54g/0.7oz~1.9oz Quantity: 20 PCS Package list: 20 x Spring Ball Plunger Screw