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 mechanism for smooth operation, secure locking, and extended service life. Function: Self-locking knob plunger allows control of pin extension and retraction via 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.