Wish you had a stocky bulldog to guard your bike day and night? OnGuard's Bulldog ATB boasts 1/2-inch hardened-steel construction and OnGuard's stout X2 double-bolt lock for top-notch protection. It also features a wide shackle, making it ideal for bigger bikes. And thanks to the included mounting bracket you can bring the Bulldog ATB along for every ride. This great U-lock also comes with 5 keys including OnGuard's Microlight key, which has a built-in light.