This is a porteur-style handlebar and stem that have been brazed and welded together. Porteur bars' long flat front area is perfect for mounting baskets or bags to.
Stem is ~30cm long. Bars are 90º to stem/head tube angle to complement standard Dutch bicycle geometry and have a 22.2mm grip diameter.
Only get these if they're going on an omafiets or opafiets, or a bike with similar geometry. For other bikes get the handlebar and stem separately so that you can dial in the angle.