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Nipple, 1/4-28 thread, for 1847 Walker & Dragoon revolvers by most mfg. including Armi San Marco, Tucker, Sherrod & Company Dragoon by A. Uberti, for #11 CCI cap, hardened steel Cone length: 0.400" Thread journal length: 0.225" Overall length: 0.625" Diameter of base: 0.307"