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Widely Applied: Widely applicable for mechanical devices, clamps, molds, automatic machines, etc. Engineers often use it in mold, fixture, assembly and other work to Use: Made of carbon steel material, these ball plungers are sturdy and durable, have good corrosion resistance and impact resistance, for a long service life Easy to Install & Use: These spring plungers are great parts for providing pressure and accurate positioning. With compace size, the plungers are easy to install and convenient to use Spring Pressure: With the help of spring pressure, our products can promote the movement of the ball and make the equipment run smoothly Super Cost-effectively: There are total 10 pieces of ball plungers in one set that you may use for many projects. And the price is reasonable. It is very cost-effective