LISTING INCLUDES: 1x Diesel Injector Seat Brush Master Cleaning Kit FIT FOR: Suitable for most diesel applications, brushes are specially designed to fit injector seats. ABOUT PRODUCT: New Helix-Style Brushes, Two-Stage Brushes and Bore Brushes 3″, 4″ and 6″ brushes, Ideal for many automotive and industrial uses. Superior Quality: Made of premium quality stainless steel with wear resistance. Upgrade Design：The driver handle and rigid extension feature a spring-loaded, quick-lock coupler. Flexible extension features a flush locking screw for access into hard to reach areas. Function： .