Product Size: M8 * 20mm Material: zinc-plated carbon steel Type: Allen screw Thread Type (Pitch): Coarse Thread Package include: 20pcs * insert nuts 1. [Wood thread inserts]: Wood thread inserts are used for pre-flush connectors for wood furniture. Standard hexagon socket head, smooth and flat, features flanged thread texture, stable structure and easy installation 2. [Applications]: These nut inserts furniture screws are suitable for hardwood / solid wood furniture, for furniture combinations 3. [Material]: Made of zinc plated carbon steel in large quantity, the thread inserts are wear resistant and very durable to use. 4. [Easy to use]: Just drill the appropriate size hole and install with the internal hex tool; External thread with unique self-tapping design and good tensile strength can contribute to tapping and effectively prevent stripping 5. [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 threaded past the end of the nut into the workpiece. machine..Items from Sheng Xinshun's shop