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I need it to have a shank that will fit onto a 4, 5 or 6mm allen key.
TIA
Topeak do a T25 one.
https://www.biketart.com/products/topeak-hummer-hexus-ii-t25-bit
Not sure about T20...
T25 from Topeak I think fits a 4 mm Allen key for trailside maintenance of disk bolts etc.
https://www.sjscycles.co.uk/tools/topeak-replacement-hummer-hexus-ii-t25-bit/
Topeak don't list one on their website. Odd.
In a simlar reply to Stanley
Something like this - https://www.autodoc.co.uk/neo-tools/20451256
Would work i think, as 1/4 inch drive sits onto a 6mm allen key and works.
Its maybe a bit of a 'bodge' but it does work
Swisstool make a 1/4" to 5mm adaptor, 1/4" bring the standard drive. I have one in my Victorinox' trail tool. Wera will likely do a T20. Wera and more available from RS for one. RS unlikely to be the cheapest but when work is buying...
Swap for a hex bolt?