This is the M5 long threaded stylus #A-5555-0331. It has a long threaded styli that is 5.0 mm. It has a stainless steel base, tungsten carbide stem, and ruby ball.
|Ball diameter (DK)||0.3 mm|
|Overall length (L)||21.8 mm|
|EWL (ML/ML1)||12.8 mm/ 2.3 mm|
|Stem diameter (DS/DS1)||1.0 mm/ 0.2 mm|
|Base diameter (DG)||11.0 mm|
|Stem Material||Tungsten Carbide|