These insert nuts are a game-changer for building or repairing wooden furniture. They give you a super strong, threaded metal socket right inside the wood. This pack has 20 pieces of M6x20mm size (that's a 6mm internal thread and 20mm long body). They're made from zinc-plated carbon steel, so they're strong and rust-resistant. Installation is a breeze: just drill a pilot hole and screw these in with a hex key (Allen wrench). The external threads and little protrusions bite into the wood, locking it in place so it won't spin or pull out. The big advantage? You only need access from one side, unlike some other nut types. Perfect for creating sturdy joints in tables, chairs, cabinets, or any project where you need a reliable, hidden fastener.