This is the M4 tool datuming styli #A-5000-6713. This is a tool datuming stylus fitted with a square tip, ground to ensure high squareness and parallelism.
Sale!
(A-5000-6713) M4 TC tool datum cube, L 96.5 mm
$102.40
A-5000-6713 | M4 tool datum cube, tungsten carbide, L 96.5 mm | Renishaw