【Durable Material】Spring indexing plunger is made of high quality stainless steel, high hardness, rustproof, sturdy and durable. 【Easy to Use】Indexing plungers, when in use, pull the handle out and rotate it 90 degrees and release. 【Lock Spring Screw】Indexing plunger with spring, smooth rotation, solid and durable, long service life. 【Uses】Self Locking Knob Plunger can control the expansion and contraction of the pin by adjusting the handle, used for indexing, positioning, or stop limit. 【Fine Thread】M10/M12/M16/M20 threads available. Specification: Material: Stainless Steel Size Chart: Overall Length: M10: 51mm/2.01inch M12: 61mm/2.40inch M16: 77mm/3.03inch M20: 90mm/3.54inch Package Includes: 1 Indexing Plunger Note: Please allow slight variations due to manual measurement and different display monitors.