Nipple, 12-28 aka 5.5-.9mm metric thread, for most brands of .31/.36 Colt and Remington pocket revolvers and many Uberti 1851, 1860, 1861 Colt & 1858 Remington revolvers, Colt brand second generation 1851 & 1860 revolvers, #11 CCI cap, hardened steel

• Cone length: 0.285"
• Thread journal length: 0.200"
• Overall length: 0.485"
• Diameter of base: 0.295"