1. The screws are made of carbon steel with a surface hardness of 500-550HRC and strong toughness 2. The screw head is sharp, easy to drill into wood and plastic 3. Sturdy and durable, the surface is galvanized, rust-proof and corrosion-resistant 4. It is suitable for screwing on woodworkers after drilling holes, and it can be used for hardwood 5. Groove type: cross 6. Screw diameter: about 4mm 7. Weight: 25mm about 190g, 32mm about 230g, 38mm about 260g, 50mm about 340g, 63mm about 410g
