Features: _x000D_ Made of stainless steel material, which can provides strength and offers good corrosion resistance in many circumstances. _x000D_ Positioning ball is also called ball head plunger or spring plunger. A load device (SLDs) consisting of a shell, spring, ball or cylinder. _x000D_ Widely used in some medical equipment, lubrication equipment, pneumatic tools and other products. _x000D_ Engineers often use it in mold, fixture, assembly and other work. _x000D_ 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. _x000D_ _x000D_ _x000D_ Specification: _x000D_ Material: stainless steel _x000D_ Size:M4*6/8/10/12/16/20(Optional) _x000D_ Weight: Approx.8g~26g/0.3oz~0.9oz _x000D_ Quantity: 20 PCS _x000D_ _x000D_ Package list: _x000D_ 20 x Spring Ball Plunger Screw 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.