This is the M5 Reference styli (red dot) #A-5555-3805. This is a styli with a high-strength stainless steel base and stem and a ruby ball.
|Ball Diameter (DK)||8.0 mm|
|Overall length (L)||63.5 mm|
|Stylus Base Width (DG)||11 mm|
|EWL (ML)||50.5 mm|
|Stem diameter (DS)||6.0 mm|
|Stem material||Stainless Steel|