Feature: 1. Nylon bristles will not scratch tile surfaces of bathtub or shower. 2. Dense brush bristles, durable for cleaning. 3. Easy to use, high efficiency and time-saving. 4. With 1/4 inch hex shank to work with electric drill, cordless drill, etc. 5. Designed for clean bathtub, grout, bathroom surface, floor, tile, shower, toilet, carpet, etc. Specification: Features: Nylon bristles will not scratch tile surfaces of bathtub or shower. Dense brush bristle, durable for cleaning. Easy to use, high efficiency and time-saving. With 1/4 inch hex shank to work with electric drill, cordless drill, etc. Designed for clean bathtub, grout, bathroom surface, floor, tile, shower, toilet, carpet, etc. Specification: Material: Nylon + Plastic Color: Yellow + Black Shank: 1/4" hex shank Diameter: 2", 3.5", 4" Package list: 3 * Brush