When first used on a drill, saw that the tip wobbled when the motor was turned on. When this drill hit the workpiece, it shook the entire drill. I put a dial indicator on it and it showed about 0.030" of runout near the cutting edge. The sharp tip can also be off-center, which can make it worse. Obviously defective and returned immediately. Bought an equivalent Bosch bit. Works just like silk, no vibration.