I work for Knipex
Monte is correct...
SB is for Point of Purchase packaging and is usually in several languages and has lot of pictures.
SBA is for Point of Purchase packaging but is in English, Spanish and French for North America
BK is for Point of Purchase in several languages
BKA is for Point of Purchase in English, Spanish and French
If there is none of these suffixes the tool is usually packed in an individual box or a plastic bag