Stabilizer is a downhole equipment used in the bottom hole assembly of a drill string. Its purpose is to mechanically stabilize the BHA in the borehole in order to avoid unintentional sidetracking, vibrations, and ensure the quality of the hole being drilled. It is composed of a hollow cylindrical body and stabilizing blades, both made of high-strength steel. The blades can be either straight or spiralled, and are hardfaced for wear resistance. Depending on the requirement stabilizer may be placed either near the bit or along the drill string.