FEATURES: Insert nuts are advantageous over barrel nuts and T-nuts because they can be installed on one side of the workpiece. GREAT QUALITY: These insert nuts are made of high-quality zinc-plated carbon steel material, which provides strength and offers good corrosion resistance in many environments. EASY TO USE: These are versatile threaded insert nuts that allow you to screw them in easily and are easy to use. NOTE: The pre-drilled hole should be as deep as the length of the insert nut and any parts of it, including the screw that can be screwed into the workpiece beyond the end of the nut. Note: The data is all measured manually, please allow an error of 1 to 3 times due to light- Color differences may occur due to color and display differences. Please refer to the actual item you receive.