ONGUARD Bulldog MINI 5013 Bicycle U-Lock X2 Power Double Bolt Locking Mechanism locks shackle on both sides M-Cylinder resists all attacks from picking, pulling or drilling Smaller shackle and narrower crossbar save weight 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.