Defender is a protective part made out of steel and can be applied directly in the cylinder of the lock itself. With that method, the overall safety’s efficiency of the door is boosted because this particular part of the door happens to be the first “strike” for burglars when they try to break in. So, defenders have the ability to protect against different techniques and ways of breaking in such as drilling of the cylinder. Based on the materials used to construct each defender and the overall technical features provided, the total burglary resistance is boosted and controlled.