198 589 00 09 00 Flexible head wrench socket - WS00.00-P-0032Z

FG 00 

Use/specification: 

Flexible head wrench socket (3-piece) 8, 10, 11 mm

Fig 1: Identifying Flexible Head Wrench Socket (198 589 00 09 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.