Buy High Quality Grinding Wheels

we are looking for grinding wheels.
our requirements.
1. materials applied in general----CR12 high carbon steel.
2. hardness of the material------HRC63-64
3. the suface requirement-----Ra0.02--0.01
4. Dimention of one specification,
circular wheels:
external diameter(300mm)x internal diameter(75mm) x (40mm thickness)
Have you got other need to know?
please confirm the price and the delivery , payment, the minimal quantity for us.