On Guard Bicycle Lock

OnGuard's Bulldog STD boasts a 13mm-thick hardened-steel shackle and OnGuard's stout X2 double-bolt lock that resists drilling, picking, bumping and pulling for top-notch protection. And thanks to the included mounting bracket you can bring the Bulldog along for every ride. This great U-lock also comes with 5 keys including OnGuard's Microlight key, which has a built-in light.