This bit set includes the most used sizes of bits needed for a wide range of tasks, also ideal for DIY projects and home maintenance and repairs. Fits with most power tools for maximum compatibility, the bit shank tightly locks into the chuck for firm and steady work, especially the quick change chuck. The two flute twist design clears out particles and chips to bring you a clean and smooth hole while decreasing the friction and heat for a cooler and faster drilling process. Made from high speed steel with superior durability and capability for maximum drilling performance, the 21 piece bit set works best for all kinds of jobs. What's more, the black oxide coating highly reduces friction performs more faster and durable. A perfect complement for those everyday drilling jobs for wood, plastic, and metal. The wide range of drill bits will help you get the job done quickly and accurately.