GREAT QUALITY: These insert nuts are made from a high quantity zinc plated carbon steel material which provides strength and offers 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 barrel nuts and screw nuts. T, as they can be installed on one side of the room. MATCHING KIT: There are 6 different sizes of nuts (see detail size in description or photos) so you can handle 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 screwed in beyond the depth. #39;end of the nut in the workpiece. Description: U n 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 this case the external protrusions bite into the wood, preventing the nut from turning or coming out.