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If it's square taper one of [these](https://www.fruugo.co.uk/risk-rl215-bike-bicycle-square-spline-axis-bb-bottom-bracket-anti-drop-auxiliary-removal-disassembly-repair-tool-fixing-rod/p-89285335-186133390?language=en&ac=bing&msclkid=06ffe751d8e61df980df85a105daeeec&utm_source=bing&utm_medium=cpc&utm_campaign=(10-20%5D_GB&utm_term=4574861728856401&utm_content=GB%20-%20(10-20%5D) should help - I've got no idea what fruugo is though so can't vouch for the website!
Edit - link looks massive but should be correct
Does anyone know if there is a general TPI for crank bolts/dust caps?
I need to secure my BB tool in place with a bolt but the TPI is higher than any bolt I have. I guess there must be some kind of standard for those BB tools that secure in place into the crank bolt thread?