Metabo 341102260 Hexagon Nut W.Recess For RSEV 19-125, RF 14-115, PWE 11-100, RF 14-115, WEV 15-150 HT, WEPBA 19-180 Qui

The Metabo part number 341102260 refers to a hexagon nut with recess, not a carbon brush, and is used across a variety of Metabo tools, including angle grinders, wall chasers, and sanders, such as 
Metabo BFE 9-20 Set Belt or Drum Sander
Metabo MFE 40 Wall Chaser 
Metabo PWE 11-100 Sander Polisher
Metabo RFEV 19-125 RT Renovation Grinder
Metabo RF 14-115 Renovation Milling Machine
Metabo RSEV 19-125 RT Renovation Grinder
Metabo WE 14-125 Inox Plus Angle Grinder 
Metabo WEV 15-150 HT Angle Grinder
Metabo WEPBA 19-180 Quick RT Angle Grinder
Metabo W 18 LTX 125 Inox Cordless Angle Grinder