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: To operate, pull the handle out, rotate it 90 degrees, and release. Lock Spring Screw: Features a spring-loaded mechanism for smooth operation, secure locking, and extended service life. Function: Self-locking knob plunger allows control of pin extension and retraction by adjusting the handle, enabling precise indexing, positioning, or stop limiting. Fine Thread Options: Available in M10, M12, M16, and M20 thread sizes. Specifications: Material: Stainless Steel Size Chart: - M10: Overall Length: 51mm (2.01 inches) - M12: Overall Length: 61mm (2.40 inches) - M16: Overall Length: 77mm (3.03 inches) - M20: Overall Length: 90mm (3.54 inches) Package Includes: 1 x Indexing Plunger Note: Slight measurement variations may occur due to manual measurement and display differences.