GREAT QUALITY: These insert nuts are made of a large amount of galvanized carbon steel, which provides strength and good corrosion resistance in many environments. EASY OPERATION: These are versatile threaded insert nuts that allow you to drive with ease and are 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. Br> FIT KIT: There are six different sizes of nuts (see detail size in description or photos), so you can manage your project for free. Br> NOTE: The pre-drilled hole should be as deep as the length of the insert nut and any parts of the screw that can be screwed into the workpiece beyond the end of the nut. Br> Description: An insert nut provides a threaded bushing for a piece of wood, similar to a wall anchor. These insert nuts are inserted into a hole pre-drilled with a screw. In this case, the outer projections bite into the wood and prevent the nut from turning or coming out. Br>