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A power drill/driver gets its name from its dual purposes. Sometimes, you use the tool as much for driving as for drilling, particularly when pre-drilling pilot holes on hard materials or using a countersunk bit to recess the screw heads. How much time is wasted as you load the drill bit into the chuck, drill a hole, remove the drill bit, load a driver bit, drive in the screw, reverse and then do it all over again? Maybe the process is not too bad if you only have a few screws to drive or your project lets you work on an assembly line to do all the drilling, change bits, and then do all the driving. Maybe you have two drills and dedicate one for drilling and one for driving. ...or maybe you should investigate the TwistLoc Drill and Drive System to learn how easily you can lessen the nuisance factor of repeatedly changing bits.

Insert the Drill Bit Holder into the Chuck
Insert the TwistLoc bit drill bit holder and a bit into the chuck.

Drill the Pilot Or Countersunk Hole
Drill the pilot hole or countersunk hole.

Twist the Driver Bit Holder Over the Original Drill Bit
Twist to add the TwistLoc driver bit holder over the original drill bit and holder. There is no need to remove the drill bit and its holder.

Place the Screw on the Magnetized Tip and Secure It
Place the screw on the magnetized tip of the driver bit and secure it.

Choose a Keyless Chuck within a Chuck Instead
Use a keyless chuck within a chuck, as an alternative. The Twistloc chuckt fits into the chuck on the power tool, accepts any standard round-shafted drill bit and uses the TwistLoc driver bit holder over the top.