OnGuard Mastiff 6 ft Chain Lock with X4 Padlock – 10 mm Hardened Steel Hex Links (180 cm / 6 ft) – Quad Lock System Boxer U-Lock Disc Lock Combo, Z-Cylinder Core, 5 Keys

The OnGuard Mastiff 6 ft Chain with X4 Padlock combines long-reach security with industry-leading strength for bicycles, e-bikes, scooters, and motorcycles. Its 180 cm (6 ft) chain features 10 mm titanium-reinforced hardened steel hex links designed to resist cutting, prying, and sawing attacks. The included Boxer U-lock padlock uses the X4P Quad Lock mechanism to secure all four sides of the shackle, eliminating weak points and resisting twisting or leverage attacks. A durable protective sleeve helps shield bike frames and vehicle finishes from scratches, while the advanced Z-Cylinder core provides resistance against bumping, picking, and drilling attempts. The Boxer padlock can also be used separately as a disc lock for motorcycles or scooters. Includes five laser-cut keys.

• Extended Reach Security: 180 cm (6 ft) hardened steel chain allows flexible locking around racks, poles, or multiple bikes and vehicles.
• X4P Quad Lock Protection: Boxer U-lock padlock secures the shackle on four sides to resist twisting, prying, and pulling attacks.
• Heavy-Duty 10 mm Hex Links: Titanium-reinforced hardened steel chain links provide strong resistance to bolt cutters and leverage attacks.
• Protective Chain Sleeve: Durable fabric sleeve helps prevent scratches and protects bike frames and finishes during locking.
• Complete Security Kit: Includes five laser-cut keys and a detachable Boxer padlock that can also function as a motorcycle disc lock.