Can a traditional round front door knob/key lock be replaced with a different style? - Quora
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Door Knobs Communicating : Ball Entry Door Knob Keyed On Both Sides : Double Locking Cylinders : Bump Resistant & Anti-Pick Pins : Automatic Latching : Keyed Alike - Amazon.com
Double Cylinder Door Knobs:
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Probrico Door Handle with Lock and Key, Chrome Door Handle Set, External Door Handle Lock, Bedroom Door Lock, 1 Pack : Amazon.co.uk: DIY & Tools
Probrico 2 Pack Entry Door Knob with Key Stainless Steel Exterior Door Knobs Round Security Front Door Lock Set Satin Nickel : Amazon.co.uk: DIY & Tools
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