20Pcs M4 304 Stainless Steel Spring Hex Socket Ball Point Grub Plunger Screw Set Cone Headless Screws(M4*12MM)

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  • 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

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