Compatible with BMW E90 N54 engine; Easy To Change Spark Plugs This magnetic spark plug socket both of end have plenty strong magnet, swivel head could hold on ratchet firmly fixed, the top could attract spark plugs, not easy to loose the plug when installingremoving, more easy and efficient Profession Spark Plug Socket The swivel head could 360 degree swivel, necessary tool for a spark plug change, and the only way to get spark plugs out on some car model Super Thin Wall We use advanced 12point design,standard is 6point, so our update version products thinner than standard spark plug sockets, and it fits perfect and good compatibility Quality Guarante This 38inch drive 16mm thin wall magnetic swivel spark plug socket made of high quality chrome vanadium steel, high hardness and not easy to damage when rotating Lifetime Warranty We offer lifetime warranty, we will refund or replace, if the product have any quality problem