STUBAI - The #5516 series are LONG BENT gouges with a #7 flute or sweep.
Note: The code explained. For a tool designated for example as as a #551612, the 55 is the SERIES, 16 is the PATTERN/SWEEP (curvature) and 12 is the nominal WIDTH in mm at the tip.
Click HERE to go to a Data Sheet on Stubai carving tools. This data sheet will explain the nomenclature used for carving tools of which there are hundreds of variants.
Click HERE to see a .pdf of the makers Series 55 catalogue.