The set includes 6 popular sizes of crowns (22, 29, 35, 44, 51, 64 mm) with the necessary accessories. In a convenient plastic box that protects against dust and dirt. The teeth are made of high-quality M42 high-speed steel, which contains 7.5-8.5 percent cobalt. Thanks to the alternating teeth, jamming is avoided during work and higher productivity is achieved.