The Mastiff combo chain lock offers ultimate security for us in high crime areas. It used oversized, titanium-reinforced hexagonal links to protect against hacksaws and boltcutters and the tight inside link dimensions protect against prying. The embroidered nylon chain cover won't crack or peel and is held in place with Velcro tabs.

Who's this item for: This is a heavy-duty lock that is suitable for use on both bicycles and motorbikes in high crime areas.

Key or combination: This is a combination lock using a smooth steel ball click gear system that resists picking and pulling. The lock comes with a code assigned and this is not resettable.

Length: 120cm long with 4mm thick steel in the links.

Materials: Titanium reinforced, hardened steel hexagonal link chain resists cutting or prying. Embroidered nylon chain cover won't crack or peel and will help to protect paint finishes.

Pros: Heavy-duty protection against hacksaws, bolt cutters, and pry bars.

Cons: Protection does come with a weight penalty so this might be a bit too much lock for most people to lug around with them.