Delta Series AR-15 Complete Brush Set is specifically designed for cleaning your AR-15. The brushes are made of a high quality stiff Nylon, spun around steel cores for added stability. The brushes feature an 8 x 32 thread that fit on the included cleaning handle or any 8 x 32 cleaning rod. The brush set has everything you need to clean your rifle, plus everything you need to keep your magazines clean and running reliably.