Blade F26X for External (Outer Diameter) Chamfering (F26X). F26X for external chamfering of pipes, tubes and other items up to 1.02" (26mm) diameter (F26X). Great for Outer Edge Deburring. Can be used with the "F" Holder or the Ratcheting "FR" Holder. Good for use on Steel, Aluminum, Copper, Brass, Cast Iron, Stainless Steel, and Plastics