3-in-1 spark plug tool with 16mm, 18mm or 21mm socket for use with 10, 12 or 14mm thread spark plug.
Size indications for NGK plugs (match first letter):
C = 10mm spark plug thread / socket size 16mm
D = 12mm spark plug thread / socket size 18mm
B = 14mm spark plug thread / socket size 21mm
Size indications for NGK plugs (match first letter):
C = 10mm spark plug thread / socket size 16mm
D = 12mm spark plug thread / socket size 18mm
B = 14mm spark plug thread / socket size 21mm