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:M5*8/10/12/16/20(Optional) Weight: Approx.15g~40g/0.5oz~1.4oz Quantity: 20 PCS Package list: 20 x Spring Ball Plunger Screw Package List 1Made of stainless steel material, which can provides strength and offers good corrosion resistance in many circumstances. 2Positioning ball is also called ball head plunger or spring plunger. A load device (SLDs) consisting of a shell, spring, ball or cylinder. 3Widely used in some medical equipment, lubrication equipment, pneumatic tools and other products. 4Engineers often use it in mold, fixture, assembly and other work. 5With the help of a certain pressure of the spring to promote the movement of the ball, so that the smooth operation of the equipment.