They look like there some alloy type ring set for either a BRNO 22 rimfire (16mm) or BRNO centre fire(19mm), they maybe some Kesslar rings made in the states? worth $40-60 if they are steel? alloy to me is worthless! Looks lik they are for 30mm scope with inserts for 1" scope also a universal ring isn't worth as much unfortunately, good luck, hope you find a good home for them, if there steel give me a shout,take care Dale