The OnGuard Mastiff 75 cm Combo Chain Lock delivers heavy-duty protection in a compact, keyless design. Featuring 6 mm titanium-reinforced, hardened-steel square links, this 735 mm (29 in) chain resists cutting, sawing, and leverage attacks while remaining easy to transport. The user-settable 4-digit Steel Ball Combo system provides smooth, precise operation without keys, ideal for commuters or shared bikes. A durable nylon sleeve protects your bike’s paint and finishes from scratches and wear. Backed by OnGuard’s trusted anti-theft protection plan, the Mastiff Combo is built for daily riders who demand convenience, reliability, and peace of mind.
- Keyless Convenience – User-settable 4-digit Steel Ball Combo system offers personalized, key-free operation that’s fast and secure.
- Strong Titanium-Reinforced Chain – 6 mm hardened-steel square links resist cutting, prying, and leverage attacks for superior theft defense.
- Compact & Portable – 735 mm (29 in) chain length balances solid protection with easy transport for urban commutes or quick errands.
- Protective Nylon Sleeve – Heavy-duty fabric cover guards paint and finishes from scratches while preventing noise during transport.
- Weather-Resistant & Reliable – Built for long-term durability with corrosion-resistant materials and OnGuard’s anti-theft protection coverage.
