Aftermarket Piston Driver Assembly for Senco SFN1 Finishing Nailer

Superior Parts SP EA0150 Aftermarket Piston Driver Assembly. This is a generic replacement driver for the Senco SFN1 Finishing Nailer. This comes with a patent pending locking mechanism which will not allow the driver to unscrew from the piston. Aluminum is crimped into the unilok grooves of the shaft to prevent unscrewing. Guaranteed never to unscrew.