From website OutdoorGearLab; "The B (basic) and T (technical) ratings are based on tests to the shaft and pick. B rating is tested to 280kg on an ice axe's pick and shaft and a T rating is 400kg on its pick and shaft. For an axe to be T rated it must have both a T rated pick and shaft. If it only gets a T rating in one category, then it gets the B rating overall. Some axes, especially those with modular picks, will show a rating on both the shaft and their pick. This is because your axe could be B or T rated depending on your pick selection." Hope this helps.