Material:Steel versionIndexing pin hardened:grade 5.8Stainless steel versionIndexing pin not hardened:Threaded body 1.4305 (AISI 303 equivalent).Indexing pin 1.4305 (AISI 303 equivalent).Mushroom knob black-gray thermoplastic.Version:Steel version:Indexing pin hardened, ground, black oxidized.Stainless steel version:Indexing pin not hardened, ground, bright.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. style C or D is recommended for applications in which the pin is disengaged over extended periods and should be prevented from springing back.On request:Special versions.