Not Original, Equivalent to 
Renishaw part number: A-5003-4860
Mitutoyo part number: K651306
Q-Mark part number: TM3-6078-G
Specification
Thread Size: M3
Stem Material: Carbon fibre
Holder material: Stainless steel
Ball Material: Ruby
Ball Diameter: 6.0mm
Overrall Length: 75mm
Stem Diameter: 4.0mm
Package: 1pc