About this 3D model

updated: you will probubly prefer a refined version http://www.thingiverse.com/thing:85851 --- I made it as "immidiate access" drill tool box. It able to hold 20 x 3 tools, etc. 20 different diameters 3 tools each. Designed for shank diameter 3.175mm. ID printed on a bottom side can correspond directly to tool number in your favorite CNC software (mach3 for example).