The Bauman D-15 Cattle Oiler Scratcher is a great way to treat cattle for lice and flies. Features a poly tank with 8 gallon capacity to easily see when it needs to be filled with an oil-based insecticide solution of your choice. The tank wicks the insecticide into the upper brush for application as the animal rubs against it. The double spring model gives extra durability and pressure for larger animals. The 18 1/2" x 4" stiff bristled brushes are securely mounted to a heavy metal frame that easily be attached to a post or wall.