Material: Stainless steel. Threaded sleeve 1.4305. Indexing pin 1.4305. Mushroom knob 1.4305, electrolytic-polish. Version: Bright. Indexing pin not hardened, ground. 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.