GREAT QUALITY: These insert nuts are made from high quantity zinc plated carbon steel material which provides strength and good corrosion resistance in many environments. EASY TO USE: They are versatile threaded insert nuts that you can easily drive with them, easy to use. FEATURES: Insert nuts are advantageous over cylindrical nuts and T-nuts, as they can be installed on one side of the part. MATCHING KIT: There are 6 different sizes of nuts (see detail size in or photos) so you can manage your project for free. NOTE: The pre-drilled hole should be as deep as the length of the insert nut and any part of the bolt that can be threaded past the end of the nut into the workpiece. An insert nut provides a threaded socket for a wooden piece, similar to a wall anchor. These insert nuts are inserted into a hole pre-drilled by a screw, in which case the external protrusions bite into the wood, preventing the nut from turning or coming out. Features: These insert nuts are made of high quantity zinc plated carbon steel for durability and rust protection. Screw nuts have an external thread and a hexagon socket. They are screwed in using a hexagonal wrench. Insert nuts are advantageous over cylindrical nuts and T-nuts, as they can be installed on one side of the part. There are screw nuts in different sizes and different screw sizes that you can choose for your project. The pre-drilled hole should be as deep as the length of the insert nut and any part of the bolt that can be threaded past the end of the nut into the workpiece.