D Lock sizes

Hi,
I have recently got into cycling and am wanting to get a D lock, ideally so it can go around railings/lamp post after having gone through my back wheel and frame. What size D lock would do this?
Thanks
I have recently got into cycling and am wanting to get a D lock, ideally so it can go around railings/lamp post after having gone through my back wheel and frame. What size D lock would do this?
Thanks
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