IF this is a service panel, then the bonding screw is required. If this is a sub-panel, then you don't use the bonding screw ... a separate equipment grounding bar is required.
I am more concerned with the use of a 60 Amp breaker on what appears to be a #10 conductor. Unless that is connected to a rather large A/C unit with similar specs on the nameplate, that would be a major code violation.
What is that 100 Amp breaker for? There are no wires connected to it. Is that for the incoming service from a meter box?
Edit to add: After looking at this again, it looks like a generator transfer switch panel? If that #10 is fed from a generator with proper overcurrent protection, then the 60 Amp breaker is fine. I would not use the bonding screw if this is the case.
somebody suggest before they might be protected at the generator properly. If so, the 60 amp rating becomes meaningless as they simply become a disconnect.
Obviously, if there is not proper protection at the generator, then yes, those wires are too small for the breaker.
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