Features: Made from Carbon steel, high hardness, rustproof, which is sturdy and durable. Self 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. Indexing plunger with spring, smooth rotation, solid and durable, long service life. Indexing plungers, when in use, pull the handle out and rotate it 90 degrees and release. Achieve precise indexing and positioning with our Knob Plunger. Perfect for DIY enthusiasts and professionals alike. Specifications: Material: Carbon steel Thread diameter: 6mm (0.24inch)/8mm (0.31inch)/10mm (0.39inch)/12mm (0.47inch) 6mm length: Approx. 33mm/1.30inch 8mm length: Approx. 43.5mm/1.71inch 10mm length: Approx. 52mm/2.05inch 12mm length: Approx. 63.5mm/2.5inch Package Includes: 1x Self Locking Knob Plunger note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.