FEATURE: No Point, Blunt Diamond Point, Diamond Point, Screw Shank or Ring ... : 15-200mm MATERIAL: High-quality Carbon-Steel Q235 1022A FEATURE: No Point, Blunt Diamond Point, Diamond Point, Screw Shank or Ring ... , wood screws, self-drilling screw, chipboard screws and so on. Umbrella Head Roofing Nails