Check the listing for details. 30-Pack Threaded Inserts for Wood, 5/16-18x20mm Nuts with A Wrench [Silver Tone]. Condition: New. Listed at 22.72 USD. PRODUCT APPLICATIONSThreaded insert nuts are often used for the connection and fastening of wooden furniture combinations. They are widely used in cabinets, sofas, desks, dining tables, chairs and connecting boards, etc.PRODUCT DETAILS & INCLUDE√ Material: Carbon Steel√ Surface Treatment: Color Galvanized√ Color: Silver Tone√ Internal Thread Size: 5/16-18√ Length: 20mm / 0.79"√ Thread External Diameter: 12.5mm / 0.49"√ Flange Diameter: 13.5mm / 0.53"√ Applicable Drill Size: 12mm / 0.47"√ Applicable Wrench Size: M8√ Package Includes: 30Pcs x Threaded Insert Nuts, 1Pc x WrenchPRODUCT ADVANTAGES1. Carbon steel material, high hardness, with galvanized surface treatment to enhance durability and corrosion resistance.2.