Keep your work area and, more importantly, your automobilia components clean. Reach for one of these threaded plugs and seal-off fluid lines and fittings for brakes, transmissions, fuel systems, and more. Available in a wide selection of sizes for general auto-shop use, they screw right into the fitting - no tool needed! - to provide a positive seal. Generous 110 piece assortment covers a wide range of straight and flared lines in four sizes, 3/16 - 1/2in..