Material: Stainless steel. Threaded sleeve 1.4305 Indexing pin 1.4034 Mushroom knob black grey thermoplastic. Version: Indexing pin 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 lockout types are recommended for applications in which the pin is disengaged over extended periods and should be prevented from springing back..