Em-D-Kay (Like Segal) Solid Bronze Jimmy Proof Deadlock Deadbolt Double Cylinder Lock Set, Commercial Grade Locksmith Quality, Bronze (US10). Solid Bronze Jimmy Proof Deadlock Deadbolt Premium Security Series Double Cylinder Bronze (US10) Finish Boxed. Shutter Guard for extra security - prohibits tampering with the lock if the outer cylinder is compromised. Solid High Strength Bronze Alloy - for the ultimate security and durability. Hardened drill point screws. comes with solid bronze case bolt, flat strike, solid brass Double cylinder, SE1 keyway With recessed cylinder collar, Boxed.