FASCO FP2121320RHDE4M 2-1/2" 20 Degree Full Round Head Plastic Strip Nail, Ring/Hot Dip $214.70 Qty Out of Stock Enter your e-mail address to be notified when product is in stock Notify Me! Add Review Ask Question Product Description Reviews (0) Questions (1) 1,000/Box - 4 Boxes/Case Sold only by the case. Currently there are no reviews for this product. What is the head diameter on Fasco FP2121320RHDE4M? Thanks, Eric Hello, Sorry I am not sure the answer to that question. You can contact Fasco at 1800-239-8665 Regards, Erika