Wire nail gripping die specifications are highly variable, depending on the specific nail size and machine, but generally include material (mild steel, carbon steel, or carbide for durability), hardness (often in HRA Rockwell Scale), dimensions (outer diameter, inner diameter, thickness, and length), and surface finish (polished or coated). The inner diameter of the die's gripping surface must match the nail's core diameter, and specific die types exist for different production needs, from standard dies to hard-facing and carbide-insert dies for high-volume or specialized applications