Features These insert nuts are made of high galvanized carbon steel for durability and rust protection Screw-in nuts have an external thread and an internal hexagon drive and are screwed in with an Allen key Insert nuts have the advantage over barrel nuts and T-slot nuts in that they can be installed from one side of the workpiece Screw-in nuts come in different sizes and accommodate 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 the portion of the screw that can be threaded into the workpiece beyond the end of the nut Description: An insert nut provides a threaded location for a wooden workpiece, similar to a wall anchor. These insert nuts are inserted by screwing into a pre-drilled hole. The outer projections grip into the wood and prevent the nut from rotating or being pulled out. Features: These insert nuts are made of high galvanized carbon steel for durability and rust protection. Screw-in nuts have an external thread and an internal hexagon drive and are screwed in with an Allen key. Insert nuts have the advantage over barrel nuts and T-slot nuts in that they can be installed from one side of the workpiece. Screw-in nuts come in different sizes and accommodate 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 the portion of the screw that can be screwed into the workpiece beyond the end of the nut. Specifications: Material: Galvanized carbon steel Type: Hexagon socket for screwing in Thread type (pitch): coarse thread Size and quantity (Optional): M6*10mm 20pcs M6*13mm 20pcs M6*15mm 20pcs M6*17mm 20pcs M6*20mm 20pcs M6*25mm 20pcs M8*13mm 20pcs M8*15mm 20pcs M8*17mm 20pcs M8*20mm 20pcs M8*25mm 20pcs M10*25mm 20pcs Package includes: 20pcs x Insert Nuts Package List