Superior Parts SP 885-917 Aftermarket Piston Driver for Hitachi NR90AD / NR90ADPR - SP 885-917

Aftermarket Hitachi Nailer Piston Driver. This is a generic replacement driver with o-ring for the Hitachi NR90AD & NR90ADPR strip nail guns. 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.