Deadbolts, on the other hand, use a locking device that is impossible to force back into the door. Even the highest quality spring bolt door lock can be easily defeated by the average burglar. There’s a reason most exterior doors have a deadbolt lock.
Measure carefully and be sure you’re using the proper size hole saw before you start drilling. If you measure incorrectly, you could end up drilling a hole in the wrong spot, ruining the door in the process. Adding a deadbolt to a door involves measuring and drilling holes to fit the deadbolt lock. Although installing a deadbolt lock is a job most DIYers can handle, there is risk of damage to the door if you’re not careful.