APPLY TO - Flat head screws are used for assembly, connecting various components like screws, nuts, and bolts. They ensure stability by connecting furniture frames, supports, and structures. Including hex locking nuts of the same size to save you time and money in sourcing nuts. ADVANTAGE - Furniture Joint Connector Bolt Kit in Different Extreme Environments; including furniture assemblies like beds, tables, cabinets, and chairs; woodworking projects involving joining wood, boards, workbenches, and kitchen countertops; as well as office appliances, 3D printing, bicycles, Photo Album, Leather, Crafting, etc.INSTALLATION - Insert the screw into the hole on one end and insert the nuts to cover the screw on the other end. Lastly, use the wrench to tighten the bolts nuts.DESIGN - Choose Carbon Steel Fasteners for: Flat head Hexagonal socket head type, uniform force that is not easy to slip, easy to use by normal hex keys, T-shaped hex keys, and electric screwdrivers. Suitable for replacing old bolts at any time.Flat Head Screws Note - Before making a purchase, please confirm the correct size needed. Using a caliper for measurement is recommended, and try to avoid using a ruler or tape measure.