Features: 1.Fitment: The magnetic swivel spark plug socket is a replacement for 1 Series E81 E87 N43B, for 3 Series E90 N43B, for 5 Series E60 N43B. 2.Unique Design: 360 degree swivel action for maximum flexibility in a tight area. And magnetic core effectively retains spark plugs and minimizes damage. 3.Magnetic Swivel: The interior magnet retains and protects the spark plug, not easy to loose the plug when installing and removing, more convenient and efficient. 4.Premium Material: Hardened and heat treated chrome vanadium alloy steel and chrome plated mirror finish maximizes longevity of abrasion and resists against rust and corrosion. 5.Important Parameter: The size of this magnetic swivel base is 14mm, the size of the driver is 3/8in, with a 12 point design, which is much thinner and fit s perfectly for operation. Specification: Item Type: Magnetic Swivel Spark Plug Socket Material: Chrome vanadium alloy steel Magnetic Swivel Base: Approx. 14mm/0.55in Point Number: 12 Driver Size: 3/8in Fitment: Fits for 1 Series E81 E87 N43B Fits for 3 Series E90 N43B Fits for 5 Series E60 N43B