The cleaning box included four of these tough brushes. They have firm bristles for deep cleaning, ergonomic handles, and the ideal shape for reaching tight spaces and difficult-to-reach areas. A very useful tool for a variety of home improvement projects and daily cleaning tasks. The Hard Bristle Crevice Cleaning Brush is a versatile and practical household cleaning tool designed to clean hard-to-reach and narrow spaces in various areas of your home.Hard Bristles: The brush is equipped with hard and durable bristles that are effective at scrubbing away dirt, grime, and stubborn stains. These bristles are ideal for tackling tough cleaning tasks.Crevice Cleaning: The brush's design, including its slim and elongated shape, is specifically intended for cleaning gaps, crevices, and tight spaces that are often difficult to reach with regular cleaning tools. This makes it an excellent choice for deep cleaning in hard-to-access areas.Versatile Use: The brush can be used in a variety of settings, including bathrooms, kitchens, windows, and other areas of your home. It is suitable for cleaning gaps and crevices around fixtures, appliances, tiles, grout, and more.All-Around Household Cleaning: This brush serves as an all-around household gap brush, helping you tackle various cleaning tasks without the need for multiple specialized tools.Effective Cleaning: The hard bristles and narrow design of the brush make it effective at removing built-up dirt and grime, ensuring a thorough and efficient cleaning process.Ergonomic Handle: Many crevice cleaning brushes feature an ergonomic handle that provides a comfortable grip and control while cleaning.Durable Construction: The brush is typically built to withstand regular use and cleaning agents, ensuring its durability and longevity.Time-Saving: This brush can save you time and effort when cleaning areas with narrow gaps, as it allows you to reach and scrub those spaces more effectively.Multipurpose Cleaning: In addition to crevices, you can use the brush for other cleaning tasks, such as scrubbing and detailing, making it a versatile addition to your cleaning toolkit.Easy to Clean: After use, the brush can be easily cleaned to remove any residual dirt and cleaning agents, ensuring that it is ready for the next cleaning task.