According to my experience, this aircraft extension ground drill bit is a must-have for any industrial and scientific cutting tools collection. The MAXTOOL extension provides longer reach for drilling deep holes and its ground flute improves chip evacuation, preventing the drill bit from overheating. The material quality is superb, ensuring durability and precision... The only con I encountered is that it may be too specialized for some users who don't need an aircraft extension. Overall, the MAXTOOL Industrial and Scientific extension drill exceeded my expectations making the drilling process effortless and efficient..