Kooples Hardware 5 Lever Roller Sashlock BS3621 Chubb 3K74 Retrofit High Security Lock Case (Satin Stainless)

• BS3621 Certified – Fully compliant for insurance-approved security standards
• Chubb 3K74 Retrofit – Matches dimensions and fixing points for direct replacement
• 5 Lever High-Security Mechanism – Anti-pick, anti-saw, and anti-drill internal components
• Roller Latch Function – Quiet, pressure-based closure without turning the handle
• Heavy-Duty Steel Build – Designed for long-lasting performance on timber doors
• Ideal for External Doors – Perfect for front, back, and side entrances requiring top-tier protection

The Kooples Hardware 5 Lever Roller Sashlock is a premium high-security mortice lock designed as a direct retrofit for the legacy Chubb 3K74 model. Built to meet British Standard BS3621, this lock offers exceptional protection against forced entry, lock picking, and drilling—making it ideal for insurance-approved door security. Featuring a unique roller latch mechanism, the door remains closed under light pressure without needing to lift the handle, offering quiet and convenient day-to-day operation. The internal 5 lever locking system engages a robust deadbolt with double-throw action, delivering maximum resistance when locked. Its dimensions and fixing points are fully compatible with the original Chubb 3K74, ensuring a quick and hassle-free replacement. Constructed from heavy-duty steel with an anti-saw deadbolt and anti-pick levers, this lock is suitable for wooden doors in both domestic and commercial settings. Whether you're upgrading your home security or replacing a worn 3K74 lock, the Kooples Roller Sashlock offers reliable performance, trusted protection, and smooth operation—ideal for front doors, rear entrances, or office entryways that demand high-grade security.