The PTG One-Piece Bolt with Handle is a high quality drop in upgrade for any Remington 700 action. Available in either fluted or solid configurations, the PTG One-Piece Bolt is made from chrome moly steel in the white and the handle is threaded for 5/16"-24 bolt knobs. Bolt is cut for an M16 extractor, not included. Notes:Headspace with these replacement bolts needs to be checked by a competent gunsmith to ensure proper fit. The magnum caliber bolts with M16 style extractors may require some fitting to the counter bore.