I have one of these sets, used the long 10mm one for ultra torque dozens of times without issue.
https://www.ebay.co.uk/itm/15pc-Metric-1-2-Drive-Hex-Allen-Allan-Wrench-Key-Socket-Bit-Set/322448919365?epid=1105371953&hash=item4b13740b45:g:d3QAAOSwdGFYw~VQ
He's going to need a step-up adapter to get a 1/2" key to work with his 3/8" ratchet.
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@gbj_tester started
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I have one of these sets, used the long 10mm one for ultra torque dozens of times without issue.
https://www.ebay.co.uk/itm/15pc-Metric-1-2-Drive-Hex-Allen-Allan-Wrench-Key-Socket-Bit-Set/322448919365?epid=1105371953&hash=item4b13740b45:g:d3QAAOSwdGFYw~VQ