23BF11U01 up for sale is a new Enco machine shop magnetic base chrome extension rod , this is 7 inches long total and the main stem is 3/8 inch the one end measures 0.3105 just under 5/16 inch , the other end measures 0.220 just under 1/4 inch , nice new old stock rod from our surplus warehouse , see our store we add new items weekly to our ebay store , thank you RWK