Adapters make it simple and easy to stone triggers and hammers for a perfect trigger pull. For use with Series 2 Stoning Fixture (sold separately). NotesAdapter for use with Power Custom Series 2 stoning fixtureAdapter holds firearm hammer in position on fixtureThis is the adapter only, the fixture or pin are not included and must be purchased separately Compatible WithRuger 10/221911Ruger Single Action & Double ActionBrowning Hi-Power& More!