Bulldog. The name suits the massive compact U-lock from the lock specialists at Onguard well. In fact, there is more to the robust appearance than just looks, but a bit of psychological warfare likely doesn’t hurt when deterring bike thieves. Thanks to the proprietary X2P Double Bolt locking system, the shackle is secured on both sides, providing high protection against pulling, impact, and leverage forces. The compact shape and hardened steel of the shackle make the Mini-Bulldog even more secure. As an ideal companion for the city, this small Onguard is perfect. Weight: 1000 g. Type: U-lock. Locking system: key lock. Material specifications: hardened steel, double rubber coating. Lock cylinder: X2P Double Power Bolt, Z-cylinder including Bump Block. Security level: 63. Theft protection: high security. Keys: 1 LED key, 4 spare keys. Lock type: key lock. Mounting: with Snap Lock QuickRelease mount. Shackle diameter: 13 mm. Shackle height: 140 mm. Shackle width: 90 mm.