OnGuard Mastiff 6 ft Chain Lock with X4 Padlock – 10 mm Hardened Steel Hex Links (1780 mm Length) – Quad Lock System Boxer U-Lock Disc Lock Combo – Z-Cylinder Core, 5 Keys (1 with LED);

The Mastiff series offers cyclists and power sports enthusiasts more high security options in a lighter, more compact package. 10mm hex-link chains and square section bar links resist attack from saws and cutters. Quattro and dual lock mechanisms feature dual lock down protection and 4 laser-cut plus 1 TorchKey. All locks have vinyl coated large diameter ultra-hardened steel shackles and rubber coated end caps. Nylon chain covers help protect painted surfaces. Backed with an anti-theft protection program.