C7 Corvette Stingray LT1 LT4 Magnetic Oil Drain Plug NEO Magnet ZO6 Z51 Grand Sport Fits: All 14 and Newer Corvettes Designed to Fit All C7 14 and Newer Corvettes. 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.