reccomend me a freewheel remover for shimano bmx freewheel

as title really… got singlespeed road bike with a shimano bmx screw on freewheel (I think – it has 4 ‘cut-outs’ for a tool to fit – I assume these are for the tool to fit done a bit of googling and it looks like this is what i have – the freewheel says shimano on it and it has four slots…).

any reccomends for a tool? I’ve done a tour of the usual suspects and not come up with anything…