Outer chamfer (without, with one or with two caps):
V901/A7, V901A7K, V901AKK
Inner chamfer (without, with one or with two caps):
V901/I7, V901I7K, V901I
For applications in nuclear power plants, with a graphite purity > 99,85%:
V901/7N
Graphite purity > 98%:
V911