If you need it, you can add me on WeChat/whatsapp to provide you with more detailed product information. Shank Type:Spiral Head Style:Flat Type:Concrete nails Material:Q195 Nails wire Head Diameter:18mm 20mm Standard:BWG Application:Concrete wall, anti-rust function Surface treatment:electricity galvanizing Feature:Very hard and creative Size:20MM*20MM 4.2MM*125MM Length:50.8mm 63.5mm 76.2mm 38mm 44.5mm Shank Diameter:4.19mm 3.73mm 3.37mm 3.02mm 2.74mm Nails normal size:2mm 2.5mm 3mm 3.2mm 3.4mm 3.6mm 3.8mm 4mm 4.2mm