About This Item UNIQUE DESIGN: The chip removal holes have a unique design on both sides of the bit. During use, you don't have to worry about the sawdust blocking the drill bit and blocking the drill bit. This will make your drilling smooth all the way and improve efficiency. MULTIPLE SPECIFICATIONS: Different sizes of wood require different types of drill bits. The hinged bit set includes 7 different sizes of bits to meet your different specifications and sizes. Our products are high quality bits that are precisely positioned and do not move. HIGH QUALITY MATERIAL: The hinged bit is made of high quality materials, hardness and high durability, which very suitable for long -term use. WIDE RANGE OF USES: simple structure, easy to use and install, high precision drill bits are used to drill holes, pilot holes precise in cabinet door hinges, handles, woodworking, etc., suitable for professional and family DIY. TIPS: When opening the holes, please adjust properly by depending on the hardness of the wood. If the wood is soft, you can choose the smaller one, if the wood is hard, you can choose the corresponding one or the larger one.