On Guard

Mastiff Chain Lock - Keyed, 1200mm x 7mm

OnGuard Mastiff Chain Lock is a keyed bike chain lock designed for riders who want serious cut resistance without the bulk of oversized links. Its 1200mm length makes it easier to secure a frame and wheel to larger racks or fixed objects, while the 7mm hex-link chain is harder for common hand tools to bite than round-link designs.

The chain is wrapped in a water- and heat-resistant protective cover to help prevent frame abrasion and keep the lock quieter in transit. A keyed locking setup keeps day-to-day use fast and consistent, and the included spare keys add peace of mind for commuting and shared bikes.

• 1200mm chain length - More reach for securing a bike to larger racks, posts, and awkward locking points
• 7mm hex-link chain - High-security link shape designed to better resist cutting leverage than round links
• Titanium-reinforced construction - Built to improve resistance to cutting attacks compared to basic chain locks
• Protective chain sleeve - Water/heat-resistant cover helps reduce paint and frame abrasion during use and transport
• Keyed lock with (5) keys - Convenient daily operation with spares for backup or multiple users