I designed this to solve a problem I had drilling overhead and having no one to sight the drill to see if it was level. Using the tubular level on the side I was able to drill while keeping an eye on the bubble. I have also added bullseye level positions to the design to allow sighting from above while looking down on the drill. 

The attachment also includes four hex bit holders, see photo's.

Made from flexible rubber with three positions for bullseye levels and two positions for cylindrical levels to be fitted and easily removed depending on drilling angles or using in your left or right hand.

Supplied with one tubular and one bullseye level as shown in photo.

To check accuracy of the inserted bubbles you can either put a rod in your chuck and place a small level on the rod and compare bubbles or insert another tubular level in the chuck (usually one doing nothing on a flat TV wall bracket). They can be slightly adjusted and should be checked as the bullseye levels need to be pushed in completely to sit flat and the attachment itself should be pressed fully into position on the drill. See last photo for an example.

THIS WILL FIT THE DEWALT DCD796 AND DCD795 DRILL WHICH HAVE A COLLAR DIAMETER OF 53mm. IT HAS NOT BEEN TRIED ON OTHER MODELS, AND THERE ARE MANY, BUT IF YOUR DEWALT DRILL HAS THE SAME SCREW TORQUE ADJUSTING COLLAR OF THE SAME DIAMETER THIS SHOULD FIT, ALTHOUGH I CANNOT GUARANTEE. PLEASE LOOK AT THE PHOTOS.

No drill supplied!