Durable Material: Spring indexing plunger is made of high-quality stainless steel, offering high hardness and rust resistance for sturdy and long-lasting performance. Easy to Use: Indexing plungers can be operated by pulling the handle out, rotating it 90 degrees, and then releasing. Lock Spring Screw: Features a spring-loaded design for smooth operation, secure locking, and extended service life. Function: Self-locking knob plunger allows control of pin extension and retraction through handle adjustment, enabling precise 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 inches M12: 61mm / 2.40 inches M16: 77mm / 3.03 inches M20: 90mm / 3.54 inches Package Includes: 1 x Indexing Plunger Note: Please allow slight variations due to manual measurement and differences in display monitors.