1Eight Size Options: Choose from eight collet sizes (0.8mm, 2mm, 5mm, 8mm, 0mm, 4mm, 0mm, 2mm) to meet your specific needs, allowing for precise and versatile drilling applications. 2Brass Material: Made from premium brass, these collets are resistant to breakage, lightweight, wear proof, and durable, ensuring long lasting performance. 3Compatibility: Compatible with all for Dremel rotating tools and flex shafts, except discontinued models 1, 2, and 1 series, or earlier 260, 270, and 280 models, providing broad compatibility for various projects. 4Improved Accuracy and Safety: The chuck collet set significantly enhance accuracy by allowing better alignment with drill tools, maintaining stability even at high speeds, resulting in improved work efficiency and safety. 5Complete Set: This kit includes eight 4485 brass collets and two metal nut chucks, providing convenience for daily replacement needs, giving you everything you need in one package.