Durable steel construction: The piston-driver assembly and bumper are made from steel for long-lasting wear resistance and consistent performance in heavy use. Exact replacement part: Engineered as an aftermarket replacement for coil nailers, this unit fits a range of models and replaces worn or damaged driver/bumper components to restore proper tool function. Precise nail driving: A 5 mm shaft diameter provides secure alignment of the nails and helps ensure accurate, reliable driving with each shot. Why you need it: Replacing a worn piston-driver assembly or bumper eliminates misfires, uneven drives, and reduced power—restoring safety, accuracy, and productivity to your coil nailer. Performance you can trust: Robust materials and correct shaft sizing maintain consistent drive force and reduce the need for frequent replacements. Typical applications Roofing and sheathing: Restores drive accuracy for consistent shingle and decking attachment. Framing and pallet or crate assembly: Ensures reliable, repeatable nail placement under continuous production conditions. Fencing and decking installation: Keeps your coil nailer performing dependably on outdoor construction tasks. Specifications Components: Piston-driver assembly and bumper Material: Steel Shaft diameter: 5 mm Type: Aftermarket replacement for coil nailers