50 mm → 68 mm class
Common tile hole clears the diamond step.
Reference
Worked hole diameter examples
Sample hole-saw checks: 50, 90, 150 mm matches and a 250 mm NO_MATCH case.
90 mm → 114 mm class
Between 68 and 114 maps to bi-metal.
150 mm → 200 mm class
Larger opening needs adjustable cutter.
250 mm → NO_MATCH
Exceeds the 200 mm ceiling on this site.
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