The OnGuard Mastiff 6 ft Chain with X4 Padlock combines long-reach security with industry-leading strength for bicycles, e-bikes, and motorcycles. Its 1780 mm (70 in) chain features 10 mm titanium-reinforced hardened steel hex links that resist cutting, prying, and sawing. The Boxer U-Lock uses the X4P Quad Lock mechanism to secure all four sides of the shackle, eliminating weak points and twist attacks. A 45 mm nylon sleeve protects paint and frames, while the Z-Cylinder core adds anti-bump, anti-pick, and anti-drill defense. The Boxer Padlock also functions as a disc lock for motorcycles or scooters. Includes five laser-cut keys (one with LED) for reliable use in low light.
- Extended Reach Protection: 1780 mm (70 in) titanium-reinforced chain secures multiple bikes or large vehicles for heavy-duty urban and motorcycle security.
- Quad Lock System: Boxer U-Lock anchors on four sides with the X4P mechanism to block twisting, pulling, and prying for maximum anti-theft defense.
- Rugged 10 mm Hex Chain: Hardened steel hexagonal links provide exceptional resistance against bolt cutters and leverage attacks.
- Protective Nylon Sleeve: 45 mm (1.8 in) cover shields bike frames from scratches and prevents rust for long-lasting durability and clean appearance.
- Keys and LED Light: Includes five laser-cut keys (one with LED) for nighttime use plus the Boxer U-Lock that doubles as a motorcycle disc lock.
