These insert nuts are made of high quantity zinc plated carbon steel material which provides strength and offers good corrosion resistance in many environments.EASY TO USE: Ces crous d'insertion sont fabriqus partir d'un matriau en acier au carbone plaqu de zinc de grande quantit qui fournit de la rsistance et offre une bonne rsistance la corrosion dans de nombreux environnements.FACILE UTILISER: 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 T-nuts because they can be installed from one side of the workpiece.ASSORTED KIT: There are 6 different sizes of nuts (see the detail size in the description or pictures) so that 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 past the end of the nut into the workpiece.Description:An insert nut provides a threaded socket for a wooden workpiece, similar to a wall anchor. These insert nuts are inserted into a pre-drilled hole by a screw, in this case the external protrusions bite into the wood, preventing the nut from turning or coming out.Features:These insert nuts are made of high-quantity zinc-plated carbon steel for durability and rust protection.The screw-in nuts feature an external thread and a hex socket. They are screwed in using a hex key.Insert nuts are advantageous over barrel nuts and T-nuts because they can be installed from one side of the workpiece.There are different sizes of screw-in nuts and different screw sizes that you can choose for your project.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.