Pro-Twist's 1-3/8 in. Cup-Head Phosphate Drywall Nails are manufactured from hardened steel to maintain durability and reduce bending during installation. The smooth shank allows for easy driving with manual or pneumatic nailers, improving speed and efficiency on the job. Perfect for residential and commercial interior projects, these nails provide reliable performance for drywall hanging, repairs, and remodeling applications where stability and precision are essential.