Many of the newer BMW models have extremely tight clearances to access the spark plugs. Regular spark plug sockets cannot fit in the spark plug wells, necessitating a specific size of socket to be used (in conjunction with a combination of socket extensions.
King Tony manufactures a thin-wall 12pt socket which easily fits into the spark plug wells, making it possible for the DIY enthusiast to change their own spark plugs when required.
3/8″ 12PT Metal Clip Spark Plug Socket 14mm
Inside sleeve – metal clip
Type: 12 points Metal clip
Size (mm): 14
D (mm): 18.5
L (mm): 63
Weight (g): 65