When you put the Wheeler AR-15 Brush Set to work, you're using cleaning tools specifically designed for your AR-15. These premium brushes are built of stiff nylon that's spun around steel cores for superior stability. Brushes feature a thread that secures to the set's handle. AR-15 Brush Set includes a handle, bolt-carrier brush, chamber brush, 22-cal. bore brush and a magazine/upper receiver brush with an integrated magazine takedown tool.