The adapter is to mount a single E3D V6 and a Nimble to the D-Bot.
This will go on the only real, original and true "D-Bot Core-XY 3D Printer", https://www.thingiverse.com/thing:1001065 from the one and only great Spauda01.
There are two versions, one with mounting points for a 50X50 radial fan, and one without. This is the version of the one without space for the radial fan.
The image shows the complete assembly, this product is only the mount and hot end clamp.
The mount and clamp are SLS printed and sent to you via UPS.