S.M. Arnold flow-thru lock-in place 5 level brushes are to be used with a specially designed handle that locks in place to prevent the brush head and handle from unscrewing during use. The five-sided soft flagged bristles on the brush will hold plentiful soap and water, while safely washing away dirt and grime. And, the bristles on five side's increases the cleaning surface area, and also helps protect the surfaces that you are cleaning. They are available in different colors and bristle material configurations, covering multiple surface area uses. The handle by S.M. Arnold is sold separately. Order the S.M. Arnold brush and S.M. handle to suit your detailing needs.