The Wooster 3" Bent Radiator Synthetic Brush is a specialty painting brush designed to go into small spaces like behind radiators or pipes. It often has a small, slanted handle that enables for easier mobility in tight locations. The synthetic bristles are perfect for use with water-based paints and stains, providing a smooth application and simple cleanup. This brush is an excellent addition to any painter's toolset, particularly for handling difficult painting projects with precision and simplicity.