A high security shackle lock which is of medium weight and has easy-to-use features.

Features:
The sentinel and sentinel duo has a key replacement service. When you buy your sentinel, simply note down the number which comes attached to the keys on a metal tag. Keep this in a safe place, then in the event that you are unfortunate enough to lose all your keys, it will be possible to get a new key made up for you.
This shackle lock has undergone rigorous independent testing and has sold secure bicycle silver.
Medium weight
New unique and clever carry bracket, will fit most bikes
Hardened steel, heavy duty construction
Vinyl coated to protect bicycle paintwork
Sentinel duo comes with an added cable lock