1. MATERIAL- C1022A material, high hardness, strong and durable, not easy to damage. 2. TREATMENT- Surface galvanized, anti-aging, anti-rust, anti-corrosion. 3. NEW DESIGN- Countersunk head plum blossom groove design, it is not easy to damage the screw head when tightening hard. When the screw is driven in, the screw hole can be leveled to make the surface smooth and beautiful. Has a high practicality. 4. HIGH EFFICIENCY- Neck thread design can improve efficiency, increase wood joining speed by 20%, and save more labor and efficiency. 5. APPLICATION- Specially for hardwood, suitable for the splicing of large-scale wood-plastic products such as outdoor gardens, carpentry fences, docks, balconies, and courtyards. Specifications: Type: Woodworking Screw Material: C1022A Mode: T25 Size: 5*80mm, 4.5*60mm, 4.5*45mm, 4.5*35mm Qty: 100PCS Package Included: 100PCS Woodworking Screw