Material: Stainless steel Sleeve 1.4301 weldable. Indexing pin 1.4305. Mushroom knob black grey thermoplastic. Version: Indexing pin not hardened, ground and bright. Note: Indexing plungers are used to prevent any change in locking position due to lateral forces. A new locking position can only be set after the pin has been manually disengaged. The form with locking slot is recommended for applications in where the indexing plungers should remain disengaged over extended periods and the pin prevented from springing back. To weld the indexing plungers we recommend inert gas-shielded welding with TIG welding equipment.