This Diamond Life Drill Bit set includes 20 bits and is designed for rotary tools. The set is perfect for various DIY projects and can be used on a range of materials, from wood to metal. The bits are made of high-speed steel and offer precise drilling and long-lasting durability. The set does not come with batteries and is suitable for use with rotary tools that do not require a voltage connection. The Diamond brand ensures quality and reliability, making this set a great addition to any tool collection. Whether you're a professional or a DIY enthusiast, this set is sure to meet your drilling needs.