These segments have 1 round 100 grit segment on a redi lock (compatible) shape to fit onto Husqvarna concrete grinders.
The purpose of using a single segment as opposed to the more common double segment is that it will grind more aggressively. This is useful for very hard concrete.
As 100 grit metal bond is the last stage before polishing with resins. These single segments will level any deep spots that may have been missed with previous passes.