Drill String Components includes a kelly, drill pipe, drill collars, stabilizers joints and various other accessories. Role is to play the next drill, transmitting mechanical energy needed to break the rock drill to drill the bottom hole pressure is applied to the well flushing fluid delivery and conduct other underground operations. Drilling stabilizers is also called centralizer, the BHA in the lower part of the drill string connected to prevent deviation or drill directional wells, and is conducive to drill smooth operation. Shock absorber for absorbing shock and vibration generated drilling load, in order to improve the life of the drill bit and other drilling tools.