How to Reinforce Door With Knob Reinforcer

Wrap-around metal plates strengthen exterior doors against break-ins.

Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

  • Cordless drill
  • Tape measure
  • 4-in-1 screwdriver
  • Drill bit set

The drill bit you'll need is a 3/32 in. bit. Any drill or flathead screwdriver will work if you don't have a cordless drill or 4 in 1 screwdriver.

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

  • Doorknob reinforcer

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