Common nails Round head nails for wooden board Material Iron Finish Galvanized Sharp diamond point Skidproof head Length 16mm/20mm/25mm/30mm/40mm/50mm/60mm/ 70mm/80mm/90mm/100mm/120mm/130mm/150mm Package 25KG/Box It is stretch resistant, rust proof and abrasion resistant. It is hard and powerful. With high tensile strength, it not easily to be loosed.