Magnetic Oil Drain Plug NEO Magnet M12-1.75 13MM Head Neodymium 5X STRONGER Designed to Fit Many Vehicles, Please Confirm Proper Size Before Ordering. Uses Neodymium (NEO) Magnet: Which is the Strongest Permanent Magnet Made. 5X Stronger then GM's Magnetic Drain Plug. Cheap added Engine Protection. Drain Plug size: Pilot Point M12-1.75, Head Size 13mm.