Excellent quality: these nuts are made of high quality zinc plated carbon steel which offers resistance and good corrosion resistance in many environments. Easy to use: these versatile threaded nuts allow you to use them easily, easy to use. Characteristics: The nuts to be inserted are advantageous compared to cylindrical nuts and T nuts, because they can be installed with one side of the room. Note: The pre-drilled hole must be as deep as the length of insertion as well as any part of the bolt which can be screwed beyond the end of the nut in the work room "