THE VICTORINOX SWISS TOOL HAS THE BEST BIT DRIVER I HAVE USED. THE SWISS SPIRIT'S BIT DRIVER RATCHETS. THAT IS AWESOME. I like that it can be used horizontally and vertically.

I BOUGHT A BIT KIT FOR MY WAVE, IT NOW HAS 40 DIFFERENT BITS. the adapter for leatherman can be used i a horizontal, diagonal, and vertical position.

GERBER AND BEAR MGC HAVE NICE BIT KITS ALSO.

THE SOG POWERLOCK HAS A QUARTER INCH DRIVER FOR USE WITH A SOCKET SET BUT I HAVE NEVER FOUND IT TO BE VERY USEFULL.