The Magnum Chain and 37/60 Granit Lock offer the greatest theft deterrent of any chain and lock combination we have found. We went to experts in chain design and to criminals, found how they defeat chains and designed our chain to withstand the abuse thieves do to chains. The Magnum Chain has two visible features not found elsewhere:
1) there is no space between the links and
2) the cross section is hexagonal instead of round or square.
There are other important features built into the chain that are not obvious but do contribute to repelling attacks. These design features add to the cost but dramatically increase the safety of the chain. The Magnums now come with a durable Nylon sleeve, to protect your bikes finish. You can purchase cheaper chains, but you can't buy anything this good.