Excellent Quality : These Insert Nuts are constructed from a wide variety of zinc plated carbon steel materials that offer strength and good corrosion resistance. Corrosion in many environments. Easy to clean. Usage: They are multi-function threaded nuts, you can just use them to drive, easy to use. Features: Flush nuts are better than cylindrical nuts and T-shaped nuts because they can be assembled on one side. of the workpiece. Note: The depth of the pre-drilled hole must be as deep as the length of the nut inserted. and any part of the bolt that can be screwed into the workpiece. over the end of the nut.