These ForgeFix Multi-Purpose Copper Clout Nails are suitable for use with softwood. They have a slightly larger head that distributes the load directly underneath the top of the nail. Thick sheeting will stay firm and secure. They have a copper finish that ensures the highest possible durability. Used in many roofing applications.These ForgeFix Multi-Purpose Clout Nails have the following specification: Size: 38mmThickness: 3.35mmFinish: CopperBag Weight: 1kgAdditional Information:• Size (mm): 38• Finish: Copper• Weight (kg): 1