Durable MaterialSpring indexing plunger is made of high quality stainless steel, high hardness, rustproof, which is sturdy and durable. Easy to UseIndexing plungers, when in use, pull the handle out and rotate it 90 degrees and release. Lock Spring ScrewIndexing plunger with spring, smooth rotation, solid and durable, long service life. UsesSelf Locking Knob Plunger can control the expansion and contraction of the pin by adjusting the handle, so as to achieve the effect of indexing, positioning or stop limit. Fine ThreadM10/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 Plungers Note: Please allow slightly errors due to manual measurement and different monitors.