ONGUARD Bulldog ATB 5011 Bicycle Bicycle U-Lock X2 Power Double Bolt Locking Mechanism locks shackle on both sides M-Cylinder resists all attacks from picking, pulling or drilling 127mm (5.0) wide crossbar provides more space for locking ATBs and scooters Hefty 13mm (0.51) hardened steel shackle resists cutting, prying and jacking Rounded design and centered keyway eliminates pry points. 5 Laser Cut Keys, 1 with a LED micro-light.