Did this set given away along with a Makita Cordless Hammer Borhschrauber and was even for the first Try this. After clamping of 6mm stone drill was noted that this was already bent. Was clamped correctly, cordless screwdrivers also brand new. So it was definitely on the drill. This is of course interrupted by 5cm flush drilling and stuck in the borehole. For the cheap price you should not expect. It has been so ever the case and can indeed buy more any defective parts if required, maybe it's as thought. When stocking drills & Bits I would, however, prefer other manufacturers. If we calculate per drill with 1 to 3 euros you already exceeds yes the total price of the set. Nevertheless good is a drill bit range, when the drills are bent.