Note: Please note that we feature only few number of selected items on our website. We stock hundreds of other selections not listed on this website. We, therefore, invite you to visit our showroom for our complete and extensive selection of various superlock door products!

When detering thiefs or criminal activity in any measure fortifying the physical enviroment significantly mitigates the effects of criminal attack. Most common methods of target hardening inlcude: 

  • Latch Interlock protector - for doors that swing inside preventing a crowbar attack upon the deadbolt or latch, with one way screws used to secure the interlock (Click this Don-Jo link to find the latch protector you want)
  • Wrap Around - increases strength deadbolt or latch from being snapped off the door and can be used to compress the door frame from a post break-in back together (Click this Don-Jo link to find the wrap around you want)
  • Astragal - for doors that swing outside opposite to interlock
  • Knob protector - covers the knob preventing a sledge hammer or crowbar prying the knob opening
  • Mortice Protector - this specifically protects mortice cylinders being opened by vice grips or any prying tools

Break-in fixed and installed with wrap around, interlock and heavy duty strike plate

Extra long interlock and wrap around


Knob Protector


Mortice Protector


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Target Hardening