Using a 1/4" hex quick-change system allows you to easily exchange between drill bits and screwdriver bits by avoiding the hassle of always having to adjust your drill chuck. Just place the quick-change chuck in your drill chuck and your ready to go. The quick-change chuck excepts all types of 1/4" hex shank bits. Just push the bits in until you hear the snap and slide the sleeve back to remove them. Because of the convenience of this type of system more and more drilling accessories are being manufactured with 1/4" hex shanks.This is a great start up set for converting standard drill bits to hex power bits. Drill bits can be changed with any style round bit of approximate style. Colbolt, Carbide, Brad Point, ect.