【Versatile Mandrel】The mandrel set is compatible with Dremel rotary tools and ideal for lightweight accessories, including carbide burrs, sanding drums, polishing wheels, and cutting discs. 【Quick-Change Mandrel】Built-in springs prevent accessories from falling or flying off during use, providing excellent stability. The quick-change chuck can accommodate various accessories from 1/32" to 1/8". 【Metal Nut】Made of metal, it is sturdy and stable. The plastic nuts available on the market often break when use, but the all-metal nuts solve this quality problem very well. They are more durable and safer than plastic materials. 【Brass Collet】Made of high-quality brass, it is strong and durable. The collet offers a great improvement in accuracy and holds bits more firmly. Not only does it remain stable at high speeds, but it also increases work efficiency.