This is a collection of sockets specifically designed for diesel engines. The set includes six injector sockets, each with a different size and number of points, including 27mm x 78mm (12PT), 22mm x 78mm (12PT), 28mm x 78mm (12PT), 22mm x 78mm (12PT) and 20mm x 78mm (12PT). This set is ideal for removing stubborn diesel injectors and glow plugs. The sockets are made from high-quality steel for durability and longevity. The set comes in a sturdy storage case for easy transport and organization. The US PRO Tools 9pc Diesel Injector & Glow Plug Removal Socket Sockets Set is a must-have for any mechanic or DIY enthusiast working on diesel engines.