Vertical INTERLOCKING THREE deadbolts made from tough & special high grade Zinc Alloy provide high strength Strongest Interlocking breaking load capacity Strong Corrosion Proof Mazak Die cast Lock Body Armored INTERLOCKING receptacle Lockable Knob(2CK) for preventing un-authorized exit Lock with in-built handle Lock/Unlock Status Indicator Antique Brass (AB) plating with electrophoretic lacquering for long life and durability Satin Nickel (SN) PU coating for enhanced aesthetics. Premium finishes with textured Dual Tone