Material: Steel grade 5.8. Mushroom knob black grey thermoplastic. Version: Indexing pin hardened, ground, black oxidized. Note: Indexing plungers are used to prevent any change in position due to lateral forces. A new locking position can only be set after the pin has been manually disengaged. The lockout types are recommended for applications in which the pin is disengaged over extended periods and should be prevented from springing back.