It is indeed a "dinort stabe" called after the infentor Oskar Dinort how was a pilot how also flow stukas.
There where 3 oficial types, the din st 70 for 50 and 70 kg bombs and had a lenght of 600mm, the din st 250 for 250 kg bombs with a lenght of 410mm and the din st 500 for 500 kg bombs and...