These are EBC discs , there are marking on the outer edge stating minimum thickness 24.0mm
On mine the front left rotor had worn through the grooves on the inner face and partially the outer face , measured min thickness 24.6mm / 24.445mm using micrometer and digital calipers.
New rotors 26.0mm
New fixings , torque to 12Nm
I will get some photo's up later and weights
Ally bell 477g
Rotor new 5.5Kg / worn 5.2Kg