GearWrench 41730D 3 Piece Magnetic Spark Plug Set Contains Long Reach Magnetic Swivel Spark Plug Sockets Covers Sizes 5/8",13/16", and 9/16" 9/16" Spark Plug Socket is 2.5" in length 5/8" Swivel Spark Plug Socket is 6" in length 13/16" Swivel Spark Plug Socket is 6" in length