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 screw in, in that case the external protrusions bite into the wood, preventing the nut from either turning or pulling out.Features:These insert nuts are made from high quantity zinc plated carbon steelfor durability and rust protection. Screw-in insert nuts have an external thread and hex socket drive and are screwed in with a hex key wrench.Insert nuts are advantageous over barrel nuts and T-nuts, because they can be installed from one side of the workpiece.There are screw-in insert nuts in different sizes and take different screw sizes that you can choose for your project.The pre-drilled hole must be as deep as the length of the insert nut plus any portion of the bolt that may be screwed past the end of the nut in the work piece.Specifications:Material: Zinc plated carbon steelType: Hex socket screw-inThread Type (pitch): Coarse threadSize and Quantity(Optional): M6x10mm 20pcsM6x13mm 20pcsM6x15mm 20pcsM6x17mm 20pcsM6x20mm 20pcsM6x25mm 20pcsM8x13mm 20pcsM8x15mm 20pcsM8x17mm 20pcsM8x20mm 20pcsM8x25mm 20pcsM10x25mm 20pcsPackage Includes:20pcs x Insert Nuts.