Features: There are 4 types, 14mm/ extension 14mm/16mm/extension 16mm, selecting based on your needs. This 3/8-inch drive thin wall magnetic swivel for spark plug socket features a 12-point design that means its walls are only 10mm thick. The for spark plug socket is made of high quality carbon steel and features 360 degree swivel action for maximum flexibility, permits access to most confined areas.. Interior magnetic for head design retains the for spark plug, protects against wear outs and allows for easy installation. Smooth 360 degree ball swivel 3/8" socket with magnetic & thin wall design. Specifications: Material: Carbon Steel Length: 14/16mm Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x 14/16 mm for Spark Plug Socket or 1x 14/16 mm for Spark Plug Socket with Extension