Durable Material: The spring indexing plunger is made of high-quality stainless steel, offering high hardness, rust resistance, and long-lasting durability. Easy to Use: To operate the indexing plunger, pull the handle out, rotate it 90 degrees, and release. Lock Spring Screw: Features a spring-loaded design for smooth operation, secure performance, and extended service life. Function: The self-locking knob plunger allows control of the pin extension and retraction by adjusting the handle, enabling indexing, positioning, or stop limiting. Fine Thread Options: Available in M10, M12, M16, and M20 thread sizes. Specification: Material: Stainless Steel Size Chart – Overall Length: M10: 51mm / 2.01 inch M12: 61mm / 2.40 inch M16: 77mm / 3.03 inch M20: 90mm / 3.54 inch Package Includes: 1 x Indexing Plunger Note: Slight variations may occur due to manual measurement and differences in display monitors.