OnGuard Bulldog DT U-Lock and Cable Combo
For maximum security, nothing beats the combination of a rock-solid U-lock working in conjunction with a super-sturdy steel cable. And that's exactly what you get with the OnGuard Bulldog DT U-Lock and Cable Combo. OnGuard's DT U-lock is operated by a laser-cut key (5 are included) and the OnGuard Z-Key cylinder is quite the theft deterrent with its pick-, pull-, and drill-resistant design. The U-lock features an ultra-hardened steel shackle that's 13mm in diameter while the braided steel cable is 4 feet long and 10mm thick to provide superb protection.