4 sizes - 1 x 4" round brush, 1 x 5" round brush for large scale cleaning, 1 x 3.5" tapered brush for cleaning corners and curved surfaces, 1 x 2" small round brush for cleaning hard-to-reach areas. Easy to meet different needs. Standard 1 inch - Compatible with all cordless drill/drivers with 1/4" thread. Save time and effort - in just a few seconds, transform the ordinary drill bit or impact driver into a powerful cleaning tool. This drill brush has great cleaning power and won’t scratch when cleaning. Material - Made up of high quality durable polypropylene. Each nylon bristle is medium in size. Widely used - A versatile cleaning kit for kitchen, bathroom, shower, tub, tile, wall, stove, sink, marble, ceramic, narrow carpets, cr andons, car tires, car seats and more.