HIGH 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 cylindrical nuts and T-nuts because they can be installed from one side of the piece.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 past the end of the nut into the workpiece.Delivery Quantity: 30pcs,Package Contents: Only the above package contents, excluding other products.Size: M815mm(Reminder: The size is measured manually, please allow 1-2 cm measurement error)Color: copper(Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)