Chrome vanadium steel with mirror polish finish for easy cleanup and laser etched sizes on each bit for easy identification The KAIFNT K201 Spark Plug Socket Set, a 9-piece 3/8-inch drive kit, offers locking extensions and spring-grip sockets for secure and efficient spark plug replacement. The KAIFNT K201 Comprehensive Spark Plug Socket Set is a 9-piece, 3/8-inch drive collection designed to simplify spark plug removal and installation for a wide range of engines Made of chrome vanadium steel, with precision spring clips and plastic retaining ring that grips metal sides tightly and protect the ceramic insulator portion when you change your spark plugs, this collection of spark plug sockets is made to last. Universal AT 3/8-Inch Drive Extension Set; 4-Piece Set - Free Shipping Thin Wall Spark Plug Socket K201 Comprehensive Spark Plug Socket Set With Locking Extensions, 3/8 9 Piece Socket Set The patent retaining spring firmly grips the nut of plugs don't worry about magnet failure or rrubber grommet falling 4pcs 3/8" DR.Universal Spark Plug Socket Set The six size of spark plug sockets to work simplify that are compatible for numerous cars, trucks, motorcycle, and other engines Set Includes:• 6-piece 3/8 drive spark plug socket with spring clip 6-point - 9/16, 5/8, 13/16-inch 12-point thin wall - 14, 16, 18mm• 2-piece locking extension bars: 6, 10• 1-piece universal joint