Unique Design: Chip holes are only designed on both sides of the drill. During use, you don't have to worry about sawdust clogging the drill bit and clogging the drill bit. This will allow your drilling to be completed smoothly and improve efficiency. Multiple Specifications: Different wood sizes require different types of drill bits. The hinged bit kit includes 7 different sizes of bits to meet your different specifications and sizes. Our products are high quality bits that are positioned precisely and do not move. High quality materials: The hinge bit is made of high quality materials, hardness and of high durability, which is very suitable for long-term use. Wide range of uses: simple structure, easy to operate and install, using high-precision drills, can drill precision guide holes in cabinet door hinges, handles, woodworking, etc., suitable for professionals and family DIY. TIPS: When opening the holes, please adjust according to the hardness of the wood. If the wood is softer, you can choose a smaller one, if the wood is harder, you can choose a larger or corresponding one. Product size: The diameter of the opening is between 0.2 and 0.6 cm Shipping quantity: 1 set, including 7 drill bits, 1 wrench