Adapters for a wide number of vehicles (spark plug types/depths) Includes 2 rubber cones ends for quick check (no need to thread into head) 3" Gauge has dual color scale with 0-300 PSI, 0-20 kPa Fittings: M10, M12, M14, M18 (Male, With "O" Ring) Includes 14mm and 18mm spark plug adapters Features: Brand New. Case size:30x20x5.8cm-(11.7"x7.8"x2.3") Use this kit to check valves and rings, inspect for carbon buildup and late timing. It includes adapters for a wide number of vehicles (spark plug types/depths). Kit includes: Includes 14mm and 18mm spark plug adapters color: as show Package Content: 2 x rubber cones ends 1 x 3" Gauge has dual color scale with 0-300 PSI, 0-20 kPa 4 x Fittings M10, M12, M14, M18 (Male, With "O" Ring) 1 x with 1/2" diameter x 14" extension hose