Product Description:  This listing is for a brand new, Performance Tool brand, 14mm spark plug socket with 12 points and a 3/8" drive.  The overall length of the socket is 63mm, the wall thickness is 2.4mm, and the outer diameter is 19.7mm. 

It is suitable for use with spark plugs with a 14mm 12 point style.  The wall thickness is about 2.4mm, and the overall outer diameter is 19.7mm, so it will suit vehicles with adequate spark plug well clearance exceeding 19.7mm.