This 20 inch nylon brush is great for cleaning any type of flooring, including VCT, concrete, terrazzo, and more. It can be used on smooth and uneven surfaces for maximum efficiency with the IPC Eagle CT45 & CT46 auto scrubbers. This spin-on / spin-off brush is easy to install and replace. Simply raise the head and press the scrub button on the control panel and it will spin off. The same can be done for attaching the brush, simply lower the head over the brush and press the scrub button on the control panel, and the brush will spin-on. The nylon bristles come with a red wear line for easy notification of when the brush needs to replaced.