RICKTOOLS MMP16 Spark Plug Wrench Drive: 3/8" (9.5mm) Spark plug socket: 16mm It shows signs of use, with scratches and rust. Also, there is a partial crack in the magnet section, so please be sure to check the condition in the photos. It is believed to be usable. Please purchase only if you understand that this is a used tool. Instant purchase is OK. Search terms: RICKTOOLS Snap-on MacTools