> The alligator-style chuck jaws close tightly and quickly on square-shanked auger bits or round-shanked twist bits.
From:
http://www.popularwoodworking.com/woodworking-blogs/chris-sc...
There's a few listed on eBay now:
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m5...