The OnGuard Mastiff 4 ft Combo Chain Lock delivers strong, convenient keyless security for bicycles, e-bikes, scooters, and outdoor equipment. The 120 cm (4 ft) chain features titanium-reinforced hardened-steel square links engineered to resist cutting, sawing, and leverage attacks in urban environments. Its user-settable 4-digit Steel Ball Combo mechanism provides smooth, reliable operation without the need for keys while maintaining tamper resistance. A durable protective nylon sleeve helps prevent scratches to frames and components while reducing noise during transport. Designed for commuters and everyday riders, the Mastiff Combo chain lock balances portability, strength, and convenience for daily security needs.

• Keyless Combination Access: Resettable 4-digit Steel Ball Combo system allows smooth operation without carrying keys.
• Titanium-Reinforced Chain Strength: 6 mm hardened-steel square-link chain engineered to resist cutting, prying, and leverage attacks.
• Extended Everyday Protection: 120 cm (4 ft) chain provides flexible locking reach for bikes, racks, poles, and gates.
• Protective Nylon Sleeve: Durable fabric cover helps prevent scratches to frames and components while reducing noise during transport.
• Durable Weather-Resistant Construction: Built with corrosion-resistant materials for reliable long-term outdoor performance.


Manufacturer Sku: 8123
Todson Sku: 45008123