Flat head to prevent the head from pulling through under load - Zinc Plated with a fluted shank to provide extra holding power - Hardened nails for use in green or predrilled concrete - Used for fixing timber to green or predrilled concrete - Zinc Plated with a fluted shank to provide extra holding power - Handy pack - External use - Perfect for heavy-duty construction and outdoor projects, the Otter Nail Concrete Fluted Zinc Plated nails offer reliable strength and durability. Each nail is designed with a fluted shaft for secure anchoring in concrete and masonry, ensuring a solid grip that holds firm over time. The zinc plating provides excellent corrosion resistance, making these nails ideal for both indoor and outdoor applications. With a length of 65mm and a diameter of 3.60mm, they are versatile enough for various carpentry and building tasks.