POSITIONING BALL: Positioning ball is also called ball head plunger or spring plunger. a load device (slds) consisting of a shell, spring, ball or cylinder. HIGH QUALITY MATERIALS: This thread s made of stainless steel material, which can provides strength and offers good corrosion resistance in many circumstances. WORKING PRINCIPLE: With the help of a certain pressure of the spring to promote the movement of the ball, so that the smooth of the equipment. APPLICABLE EQUIPMENT: This thread is widely used in some medical equipment, lubrication equipment, pneumatic tools and other products and the engineers often use it in mold, fixture, assembly and other work. SATISFACTION GUARANTEE: We care for every customers feeling.if this product does not meet or exceed your expectations,please send it back for a refund no questions asked., Weight: 0.0440924524 pounds, Manufacturer: Hilitand