The interaxis between the spindles are suitable for mounting the metalware for closing the windows.
The central shaft, driven directly by the drill, also turns the lateral satellite bits, for this reason, on the two lateral spindles, you must mount bits with left rotation.
 

Suitable for column drills.
Special trilobate connection that allows an optimal dragging with any chuck.

75 mm stroke.
You can easily place a window or door.
Center line - to give an immediate visual reference.
Depth stop.

The photo shows the Ø 12 and Ø 26 mm bits, which are included in the package.