In the set, drills for wood, metal, concrete, while they are alive, everything seems to be fine with drills. Bits two pieces for three days, the crosspieces were ground off for ejection. In general, a set for a four because of the bit. I don’t even know which manufacturer of bits can be taken at all, the apparently expensive DeWalt and Milwaukee Bosch Makita are, to put it mildly, short-lived.