The Superior Parts SP R250SFE is a generic replacement Piston Driver with O-Ring that excels in performance and durability that's compatible with Ridgid R250SFE Nailer's. Manufactured with our UNI-LOK technology that hydraulically crimps the grooves of the shaft to ensure the piston driver never unscrews. Drivers do not unscrew even at 80 N-M(59ft-lbs) during torque testing. The aluminum piston driver is heat treated to provide strength, durability and performance. A reliable replacement for OEM parts and highly recommended by Tradesman in the field. Compatibility: Ridgid R250SFE Specifications: Material: Premium Grade Aluminum Hardness: 59 HRC