Interlocking with angle strike. Solid bronze construction with brushed brass finish. Mounts to wood or metal doors and frames. Segal locks are an industry standard for home security.
Lockset consists of: Lock, angle strike, rim cylinder, 2 keys, cylinder trim ring, screw pack, mounting plate and instructions. (Priced brand new @ www.asklocksmith247 for 85.00; @ www.giahardware for 54.99.)
Another commercial grade locksmith quality lock hidden away here @ Harry's.