Is that the model number on the drill itself?
The only Metabo RAD kit I can find is listed as a model A626.
I see that you can also purchase just their Right Angle Drive attachment to convert many of their standard 1/2" drills and hammerdrills to a right angle drive.
That setup looks similar to the smaller Milwaukee Magnum RAD Hole-shooter.
I think the closest thing I own to that size drill is the old Milwaukee 3107 RAD kit, but it is just way too slow and underpowered for me, so I usually use the larger DeWalt DW124 joist and stud RAD.