- 14mm candle wrench constructed from high quality steel for durability and a long service life. It is rust resistant, wear resistant, and corrosion resistant, and designed to resist deformation over time. - Normal size: 12 pin 3/8 inch design with an outer diameter of 18.5 mm, providing a secure grip and easy installation and use. - Ultra-thin walls: thin-walled body with a smooth, burr-free surface. Lighter and more flexible, it reaches into tight spaces more easily without sacrificing strength. - Built-in spring plate: internal spring plate keeps the candle (spark plug) secure during installation, reducing the risk of dropping or losing the plug. - Applications: ideal for replacing spark plugs on most vehicles with 14mm plugs; suitable for work in tight engine bays or overhead positions where space is limited; also compatible with small engines and motorcycles that use 14mm plugs.