Download Data sheet: 200-218 ArticleNo/ P/N: 10000-461 1" ADAPTER TUBE HD G1"-11 (58 MM) Adapter Tube for placing all Marine an Base Station Antannas with 1" Revolving Nut Mounting . System (G1"-11) on any US-style 1"-14NF threaded brackets. Chrome plated solid brass. Price request Download Data sheet: 200-218