I prefer the design of the Abus linked above, because its difficult to get at with an angle grinder or a boltcutter. The one I've shown above is more vulnerable, but still a good option. The shackle parts need to fit inside the links, so I would think very few would exceed 11mm.
I prefer the design of the Abus linked above, because its difficult to get at with an angle grinder or a boltcutter. The one I've shown above is more vulnerable, but still a good option. The shackle parts need to fit inside the links, so I would think very few would exceed 11mm.