Holoras 16mm (5/8") & 21mm (13/16") Spark Plug Socket allows you to remove and replace spark plugs as easily as possible. Made of durable, heat treated, chrome vanadium steel, this spark plug socket has Chrome plating for easy cleanup and a pro look in addition to its 360 degree swivel action for maximum flexibility. Package Includes: 1 x Spark Plug 1 x 16mm socket 1 x 21mm socket