Quick Change D'VersiBIT® Extension System Kit. .5" x 5" x 39.25" (12.7mm x 127mm x 996.9mm). All the same great features as a traditional flexible drill bit , but with even more flexibility and versatility. For use when drilling between studs and joists. Can use with any type of bit with a 1/4" quick change hex on it, such as spade bits, auger bits or drill bits for increased application flexibility. Replace only the bit as it wars rather than the entire bit and shaft for lower overall cost of ownership. Quickly and easily switch from drilling to pulling with the quick change pulling grip.