Vintage 1" Winchester swivels. These swivels were factory installed on many of the old models. 70s 94s 75s 69s 12s 97s and many others. These are new old stock from the Winchester factory. Swivel base measures 1.365 in long by .500 in wide. You can knock out the pin and remove swivel to make super grade bases. I'm down to my last 30 sets. For multible auctions or sets I will combine shipping. Sorry no mounting screws.